Magnetic Intensity 348Magnetic Lag 348Magnetic Latitude 348Magnetic Leakage 348'Magnetic Limit 348Magnetic Lines of Force 348Magnetic Mass 349Magnetic Matter 349Magnetic Memory 349Magnetic Meridian 349Magnetic Moment 349Magnetic Needle 349Magnetic Needle, Declination of the 178Magnetic Needle, Dip of 185Magnetic Needle, Oscillation of a 397Magnetic Output 399Magnetic Parallels 349Magnetic Permeability 349Magnetic Perturbations 350Magnetic Poles 350Magnetic Potential 350, 431Magnetic Proof Piece 350Magnetic Proof Plane 350Magnetic Quantity 350Magnetic Reluctance 351, 458Magnetic Reluctivity 351Magnetic Remanence 358Magnetic Repulsion 338Magnetic Resistance 458Magnetic Retentivity 351Magnetic Rotatory Polarization 351Magnetic Saturation 251Magnetic Screen 351Magnetic Self-induction 352Magnetic Separator 352Magnetic Shell 352Magnetic Shell, Strength of 352Magnetic Shield 353Magnetic Shunt 353Magnetic Storms 353Magnetic Strain 354Magnetic Stress 354Magnetic Susceptibility 254, 359Magnetic Tick 354Magnetic Top 542Magnetic Twist 354Magnetic Vane Ammeter 27Magnetic Variations 354Magnetism, Ampere's Theory of 354Magnetism, Blue 355Magnetism, Components of Earth's 356Magnetism, Creeping of 356Magnetism, Decay of 356Magnetism, Discharge of 356Magnetism, Electro 220Magnetism, Ewing's Theory of 356Magnetism, Free 356Magnetism, Hughes' Theory of 357Magnetism, Lamellar Distribution of 357Magnetism of Gases 357Magnetism, Red 357Magnetism, Residual 358Magnetism, Solenoidal Distribution of 358Magnetism, Sub-permanent 358Magnetism, Terrestrial 358Magnetism, Weber's Theory of 358Magnetization by the Earth 359Magnetization by Double Touch 358Magnetization by Separate Touch 359Magnetization by Single Touch 359Magnetization, Coefficient of Induced 359Magnetization Curve 172Magnetization, Cycle of 360Magnetization, Elias' Method of 360Magnetization, Hoffer's Method of 360Magnetization, Intensity of 360Magnetization, Isthmus Method of 360Magnetization, Jacobi's Method 360Magnetization, Limit of 361Magnetization, Maximum 361Magnetization, Specific 361Magnetization, Surface 356Magnetizing Coil 127Magneto 361Magneto Bell 80Magneto Call Bell 361Magneto-electric 361Magneto-electric Brake 362Magneto-electric Generator 362Magneto-electric Generator, or Dynamo, Flashing in a 257Magneto-electric Key 315Magneto-electric Telegraph 512Magnetograph 363Magneto-inductor 363Magnetometer 363Magnetometer, Differential 365Magnetometry 364Magneto-motive Force 365Magnetophone 367Magnetoscope 365Magnifying Spring Ammeter 28Magnus' Law 367Main Battery 66Main Battery Circuit 125Main Circuit 125Main or Standard Feeder 251Mains, Electric 367Make 367Make and Break Current 164, 367Make and Break Key 316Make-induced Current 163Malapterurus 367Map, Declination 309Map, Inclination 297Map, Isoclinic 308Map, Isodynamic 308Map, Isogonic 309Marié Davy's Battery 67Marine Galvanometer 269Mariner's Compass 142Marked End or Pole 368Marriage Joint 310Mass, Electric 368Mass, Magnetic 349Master Clock 127Mathematical Element 237Matteueci's Experiment 369Matter, Electric 368Matter, Fourth State of 261Matter, Magnetic 349Matter, Radiant 368Matter, Ultra Gaseous 551Matthiessen's Meter-gram Standard Resistance,. 466Matthiessen's Unit of Resistance 466Matting, Electric Floor 369Maximum Magnetization 361Maxwell's Theory of Light 369Mayer's Floating Magnet 370Maynooth's Battery 67Measurement, Absolute 8Measurements 370Mechanical Equivalent of Heat 286Mechanical Energy 241Mechanical Equivalent, Electro- 244Medical Battery 67Medium, Polarization of the 424Meg or Mega 370Meidinger's Battery 68Memoria Technica, Ampére's 30Memory, Magnetic 349Mercury 371Mercury Bichromate, Battery 63Mercury Circuit Breaker 121Mercury Cups 371Mercury, Sulphate of, Battery 67Mercurial Air Pump 16Meridian, Astronomical 372Meridian, Geographic 372Meridian, Magnetic. 349Merit, Figure of 256Merit, Formula of 256Metal, Gilding 277Metallic Arc 39Metallic Circuit 125Metallochromes 392Metallurgy, Electro- 222Metals, Law of Intermediate 323Meter. Alternating Current 373Meter, Ampere and Volt, Galvanometer . 274Meter, Balance Ampere 391Meter Bridge 373Meter Bridge, Slide 486Meter Candle 374Meter, Chemical Electric 375Meter, Current 375Meter, Electro-magnetic 375Meter, Energy 375Meter Gram Standard Resistance, Matthiesen's 466Meter-millimeter 375Meter-millimeter Unit of Resistance 466Meter, Neutral Wire Ampere. 391Meter, Quantity 445Meters. Ampere 39Meter, Thermal-Electric 375Meter, Time Electric 375Meter, Watt 375Method, Broadside 89Method, Deflection 178Method, End on 238Method, Idiostatic 295Method, Multiple Wire 388Method, Null 393Method of Magnetization, Elias' 360Method of Magnetization, Isthmus 360Method of Magnetization, Jacobi's 360Methven Standard or Screen 376Mho, 376Mica 376Mica, Moulded 376Micro 376Micrometer 376Micrometer, Arc 39, 376Micrometer, Spark 470Micron 376Microphone 376Microphone Relay 377, 457Microscope. Photo-electric 410Microtasimeter 377Mil 379Mil, Circular 379Mil-foot 379Mil-foot Unit of Resistance 467Milli 379Milligram 379Millimeter 379Milli-oerstedt 380Mil, Square 379Minute, Ampere- 30Mirror Galvanometer. 271Mixed Gases 275mm. 380Molar 380Molar Energy 241Molecular Affinity 380Molecular Attraction 380Molecular Bombardment 380Molecular Chain 380Molecular Energy 241Molecular Heat 286Molecular Rigidity 380, 473Molecular Shadow 480Molecule 380Moment 381Moment, Magnetic 349Moment of Couple 544Moment, Turning 544Monophote Lamp 321Mordey Effect 381Morse Receiver 381Morse Recorder 451Morse Telegraph 512Mortar, Electric 382Motion, Currents of 167Motograph, Electro- 229Motor. Compound or Compound Wound,. 382Motor, Differential 382Motor, Dynamo 200Motor, Electric 382Motor, Electro- 229Motor, Electro-motive Force 384Motor-generator 384Motor, Multiphase 384Motor, Overtype 399Motor, Prime 385Motor, Pulsating 386Motor, Pyromagnetic 442Motor, Reciprocating 385Motor, Series 386Motor, Shunt 386Moulded Mica 376Moulding 58Movable Secondary 477Mud, Battery 68Multiphase Currents 166Multiphase Motor 384Multiple 386Multiple Arc 387Multiple Arc Box 387Multiple Connected Battery 68Multiple-series 387, 480Multiple Switch 501Multiple Switch Board 387Multiple Transformer 548Multiple Winding 579Multiple Wire Method 388Multiplex Harmonic Telegraph 510Multiplex Telegraph 514Multiplex Telegraphy 388Multiplier, Schweigger's 476Multiplying Power 347, 349Multiplying Power of a Shunt 388Multipolar Armature 46Multipolar Dynamo 200Multipolar Electric Bath 57Multipolar Winding 579Muscular Pile 388Mutual Electro-magnetic Induction 302Mutual Electrostatic Induction 303Mutual Induction, Coefficient of 301Mutual Induction Protector 481Myria 388Nairne's Electrical Machine 389Napierian Logarithms 389Nascent State 389Natural Currents 166, 389Natural Magnet 361Needle 389Needle Annunciator 35Needle, Astatic 50Needle, Dipping 185Needle, Magnetic 349Needle, Orientation of a Magnetic 397Needle of Oscillation 389Needle Telegraph, Single 519Needle, Telegraphic 389Negative Charge 389Negative Current 164Negative Electricity 389Negative, Electro- 229Negative Element 390Negative Feeder 251Negative Lead of Brushes 324Negative Plate 417Negative Pole 425Negative Potential 432Negative Side of Circuit 125Nerve and Muscle Current 164Nerve Currents 390Net Efficiency 205Net, Faraday's 250Network 390Neutral Armature 46Neutral Feeder 251Neutral Line of Commutator 390Neutral Line of Magnet 361Neutral Point 421Neutral Point of Commutator 390Neutral Point, Thermo-electric 390Neutral Relay Armature 46, 390Neutral Temperature 390Neutral Wire 390Neutral Wire Ampere Meter 391N. H. P. 391Niaudet's Battery 61Nickel 391Nickel Bath 391Night Bell 392Nitric Acid Battery 68Nobili's Rings 392Nodal Point 422Nodular Deposit 392Nominal Candle Power 101Non-conductor 392Non-essential Resistance 465-467Non-inductive Resistance 467Non-polar Dynamo 200Non-polarizable Electrodes 210Non-Polarized Armature 46Normal Magnet 361North Magnetic Fluid 357North Pole 392North Seeking Pole 393Null Method 393Null Point 422Occlusion 393Oerstedt 394Oerstedt's Discovery 394Oerstedt, Milli- 380Ohm 394Ohmage 394Ohm, B. A. 394Ohm, Board of Trade 394Ohm, Congress 395Ohmic Resistance 394, 467Ohm, Legal 395Ohmmeter 395Ohm, Rayleigh 396Ohm's Law 396Ohm, True 396Oil Insulation 396Oil Transformer 548Old Armature, Siemens' 49Olefiant Gas 397Omnibus Bar 94Omnibus Rod 94Omnibus Wire 94One Coil Electro-magnet 219Open 397Open Circuit 125Open Circuit Battery 68Open Circuit Induction 303Open Circuit Oscillation 397Open Coil Armature 46Open Coil Dynamo 200Opening Shock 482Operation, Magnet 365Opposed Current 164Optics, Electro- 229Orders of Currents 167Ordinate 397Ordinates, Axis of 54, 397Ores, Electric Reduction of 453Ores, Magnetic Concentration of 340Organ, Electric 397Orientation of a Magnetic Needle 397Origin of Co-ordinates 397Oscillation, Centre of 112Oscillation, Electric 398Oscillation, Needle of 389Oscillation, Open Circuit 397Oscillatory 23Oscillatory Discharge 188Oscillatory Displacement 398Oscillatory Electro-motive Force 398Oscillatory Impedance 297Oscillatory Induction 398Osmose, Electric 398Outlet 399Output 399Output, Magnetic 399Output, Unit of 399Over-compounding 399Over, Flashing 258Overflow Alarm 18Over-house Telegraph 515Overload 399Overtype Dynamo or Motor 399Oxide of Copper Battery 68Ozone 399Pacinotti's Inductor 400Pacinotti's Ring 400Pacinotti Teeth 400Page Effect 401Page's Revolving Armature 47Paillard Alloys 400Palladium 401Pane, Fulminating 262Pane, Luminous 401Pantelegraphy 402, 510Paper Filaments 402Parabola 402Parabolic Reflector 402Paraffine 402Paraffine Wax 402Paragrêles 403Parallax 403Parallel 403Parallel Circuits 123-126Parallelogram of Forces 260Parallels, Magnetic 349Paramagnetic 403Paramagnetism 404Parasitical Currents 163Parchmentizing 404Partial Current 164Partial Earth 203, 404Partial Vacuum 557Passive State 404Path, Alternative 24P. D. 404Peltier's Cross 405Peltier Effect 404Pen, Electric 405Pendant Cord 405Pendulum Circuit Breaker 121Pendulum, Electric 405Pendulum or Swinging Annunciator 35Pentane Standard, Harcourt's 406Pentode Working 581Percussion, Centre of 112Perforated Armature 45Perforated Core Discs 154Perforator 407Period 407Period, Vibration 560Periodic 23Periodic Current, Power of 433Periodicity 262, 408Peripolar Zone 582Permanency 408Permanent Magnet 365Permanent Magnet Ammeter 28Permanent State 408Permeability 346-349Permeability-temperature Curve, 174Permeameter 408Permeance 408Peroxide of Lead Battery 69Perturbations, Magnetic 350Pflüger's Law 409Phantom Wires 409Phase 409Phase, Retardation of 471Phenomenon, Porret's 427Pherope 409, 527Philosopher's Egg 409Phonautograph, 409Phone 409Phonic Wheel 409Phonograph 410Phonophone or Rate Governor, Langdon Davies' 450Phonozenograph 410Phosphorescence 410Phosphorous, Electrical Reduction of 410Photo-electric Microscope 410Photo-electricity 410Photo-electro-motive Force 410Photometer 411Photometer, Actinic 411Photometer, Bar 411Photometer, Bunsen's 412Photometer, Calorimetric 412Photometer, Dispersion 412Photometer, Shadow 414Photometer, Translucent Disc 412Photophore 415Photo-voltaic Effect 415Physical Energy 241Physiology, Electro- 231Piano, Electric 415Pickle 415Picture, Electric 415Piece, Bed 78Piece, Magnetic Proof 350Piece, Pole 423Pierced Core-discs, 152Pile 415Pile, Differential Thermo-electric 533Pile, Muscular 388Pile or Battery, Thermo-electric 530Pilot Brush 91Pilot Lamp 323Pilot Transformer 415Pilot Wires 415Pistol, Electric 416Pith 416Pith Ball Electroscope 234Pith-balls 416Pivoted Armature 47Pivot Suspension 416Plane, Magnetic Proof 350Plant 417Plant Electricity 417Plant, Isolated 309Planté's Secondary Battery, 72Plate, Arrester 417Plate Condenser 417Plate, Earth 203Plate Electrical Machine 417Plate, Franklin's 262Plate, Generating 277Plate, Ground 417Plate, Negative 417Plate, Positive 277, 417Plating Balance 417Plating Bath 418Plating, Electro- 418Platinized Carbon Battery 69Platinoid 418Platinum 419Platinum Alloy 419Platinum Black 419Platinum Silver Alloy 419Platinum Sponge 419Play, End 238Plow 420Plücker Tubes 420Plug 420Plug Cut Out 175Plug, Double 191Plug, Grid 420Plug, Infinity 305, 420Plug Key 316Plug Switch 420Plumbago 421Plunge Battery 69Plunge 421Plunger and Coil 131Plunger and Coil, Differential 132Plunger, Coil and 131Plunger Electro-magnet 220Pneumatic Battery 69Pneumatic Signals, Electro- 231P.O. 421Pockets, Armature 47Poggendorf's Solution 421Point, Contact 147Point, Indifferent 421Point, Neutral 421Point. Nodal 422Point, Null 422Point of Commutator, Neutral 390Point Poles 422Points, Consequent 422Points, Corresponding 422Points, Iso-electric 422Points of Derivation 180, 423Point, Thermo-electric Neutral 390Polar Angle 423Polar Extension 423Polarity, Diamagnetic 181, 423Polarity, Resultant 470Polarization 423Polarization, Back Electro-motive force of 156Polarization Capacity 424Polarization, Dielectric 183Polarization, Galvanic 265Polarization, Magnetic Rotary 351Polarization of the Medium 424Polarized Armature 47Polarized Electro-magnet 220Polarized Relay 458Polarized Relay, Tongue of 542Polarizing Current 164Polar Region 424Polar Span 424Polar Span, Angle of 32, 423Polar Tips 423Polar Zone 582Pole, Analogous 31, 425Pole, Antilogous 425Pole, Armature 47Pole, Austral 54Pole, Boreal 85Pole Brackets, Telegraph 515Pole Changer 425Pole Changing Switch, 501Pole Dynamo, Interior 199Pole, Magnet 366Pole, Negative 425Pole, North 392Pole, North-seeking 393Pole or End, Marked 368Pole Piece 423Pole Pieces 425Pole, Positive 425Pole, Salient 426Pole, Terminal 529Pole Tips 290, 426Pole, Traveling 426Pole, Unit Magnet 366Poles 425Poles, Compensating 426Poles, Consequent 146Poles, Idle 296Poles, Magnetic 350Poles, Magnetic, False 350Poles of Intensity 426Poles of Verticity 426, 560Poles, Point 422Poles, Secondary 478Poles, Secondary Magnet 366Polyphase Currents 167Polyphote Lamp 323Popgun, Electric 282Porous Cell 427Porous Cup 159, 426Porret's Phenomenon 427Portative Power of Magnet 366Portelectric Railroad 427Portrait, Electric 415Position, Energy of 241Position Finder 427Position, Sighted 484Positive Current 164Positive Direction 428Positive Electricity 428Positive Element 277Positive Feeder 251Positive Plate 277, 417Positive Pole 425Positive Potential 432Positive Side of Circuit 125Post Office 428Posts, Binding, or Screws 81Potential 428Potential, Absolute 428Potential, Constant 429Potential Difference, Contact 147Potential Difference, Electric 429Potential Difference, Electro-motive 429Potential, Electric Absolute 429Potential, Fall of 430Potential Galvanometer 269Potential in Armature, Curve of Distribution of 172Potential, Magnetic 350, 431Potential, Negative 432Potential or Static Energy 241Potential, Positive 432Potential Regulation, Constant 455Potential, Unit of Electric 432Potential, Zero 432, 582Potentiometer 432Poundal 433Pound-foot 259Power 438Power, Candle 100Power, Directive 187Power, Electric 433Power, Horse 290Power, Illuminating 296Power, Multiplying 349Power of Magnet, Portative 366Power of Periodic Current 433Powers of Ten 527Power, Stray 495Power, Thermo-electric 533Press Button 94Pressel 434Pressure 434Pressure, Electric 434Pressure, Electrification by 434Primary 434Primary Ampere-turns 31, 551Primary Battery 69, 434Prime 434Prime Conductor 146, 434Prime Conductor, Coatings of a 129Prime Motor 385Principle, Gauss' 276Printing Telegraph 515Probe, Electric 435Projecting Power of a Magnet 435Prony Brake 435Proof Piece, Magnetic 350Proof-plane 436Proof Plane, Magnetic 350Proof-sphere 436Proportional Galvanometer 269Proportionate Arms 436Prostration, Electric 437Protector, Body 84Protector, Comb 437Protector, Electric 437Pull 437Pulsatory Current 164Pulsatory Field 256Pulsating Motor 386Pulvermacher's Electro-medical Battery 69Pump, Geissler 437Pump, Sprengel 439Pump, Swinburne 440Pumping 439Puncture-electro 232Puncture-galvano 232Push Button 93. 98, 440Push, Desk 180Push, Floor 258Pyro-electricity 441Pyromagnetic Generator 442Pyromagnetic Motor 441Pyromagnetism 443Pyrometer, Siemens' Electric 443Q 443Quad 288, 443Quadrant 288, 443Quadrantal Deviation 180Quadrant, Legal 444Quadrant, Standard 444Quadrature 444Quadruplex Telegraph 515Qualitative 444Quality of Sound 444Quantitative 444Quantity 444Quantity Armature 47Quantity, Electric 444Quantity, Electro-magnetic 445Quantity, Electro-magnetic, Practical Unit of 445Quantity, Electrostatic 445Quantity Galvanometer 269Quantity, Magnetic 350Quantity Meter 445Quartz 445Quicking 446R 446Racing of Motors 446Radial Armature 47Radian 446Radiant Energy 446Radiant Matter 368Radiation 446Radicals 446Radiometer 447Radiometer, Electric 447Radio-micrometer 447Radiophony 447Railroad, Portelectric 427Range Finder 447Rate Governor 449Rate Governor or Phonophone, Langdon Davies' 450Rated Candle Power 101Ratio Arms 437Ratio, Core 154Ratio, Shunt 483Ratio, Velocity 560Ray, Electric 450Rayleigh Ohm 396Reaction Coil 132Reaction of a Dynamo Field and Armature 450Reaction of Degeneration 179Reactions, Anodic 36Reactions, Armature 47Reaction Telephone 527Reaction Wheel 259Reading Galvanometer, Direct 269Reading, Sound 489Reading Telescope 450Real Efficiency of Secondary Battery 205Real Hall Effect 284Réaumur Scale 450Recalescence 451Receiver 451Receiver, Harmonic 284, 451Receiver, Morse 381Receptive, Electro- 232Recharge 115Reciprocal 451Reciprocating Motor 385Recoil Circuit 125Recorder, Chemical 117Recorder, Morse 451Recorder, Siphon 452Record, Telephone 451Rectification of Alcohol, Electric 18Rectified Current 164Rectilinear Current 165Red Varnish 559Red Magnetism 357Redressed Current 165Reduced Resistance 467Reducteur for Ammeter 453Reducteur for Voltmeter 453Reduction of Ores, Electric 453Reduction of Phosphorous, Electrical 410Reflecting Galvanometer 270Reflector, Parabolic 402Refraction, Electric Double 454Refraction, Electrostatic 235Refreshing Action 454Region, Extra-polar 454Region, Intrapolar 307Region, Polar 424Register, Electric 454Register, Telegraphic 454Regulation, Constant Current 454Regulation, Constant Potential 455Regulation of Alternating Current Dynamo 195Regulation of Dynamos 455Reguline 456Relative 456Relative Calibration 98Relay 456Relay Bell 80Relay Bells 457Relay, Box Sounding 457Relay Connection 457Relay, Differential 457Relay Magnet 457Relay, Microphone 377, 457Relay, Neutral, Armature 390Relay, Polarized 457Reluctance 458Reluctance, Magnetic 351, 458Reluctance, Unit of 438Reluctivity 459Reluctivity, Magnetic 351Remanence 459Remanence, Magnetic 358Removal of Hair by Electrolysis 283Renovate 115Repeater 459Repeater, Telegraph 518Replenisher, Sir Wm. Thomson's 459Repulsion, Magnetic 338Repulsion and Attraction, Electrostatic 234Repulsion and Attraction, Electro-magnetic 217Reservoir, Common 460Residual Atmosphere 460Residual Capacity 103Residual Charge 116Residual Magnetism 358Residue, Electric 116, 460Resin 460Resinous Electricity 461Resistance 461Resistance, Apparent 297, 462Resistance, Assymmetrical 462Resistance Box 462Resistance, B. A. Unit of 462Resistance Box, Sliding 463Resistance, Breguet Unit of 463Resistance Bridge 577Resistance Coil 137Resistance Coil, Standard 464Resistance, Carbon 463Resistance, Combined 464Resistance, Compensating 144Resistance, Critical 464Resistance, Dielectric 183, 464Resistance, Digney Unit of 464Resistance, Electrolytic 464Resistance, English Absolute or Foot-second Unit of 465Resistance, Equivalent 465Resistance, Essential 465Resistance, External 465Resistance Frame 465Resistance, German Mile Unit of 466Resistance, Hittorf's 466Resistance, Inductive 466Resistance, Insulation 466Resistance, Internal 466Resistance, Jacobi's Unit of 466Resistance, Joint 464Resistance, Magnetic 351, 458Resistance, Matthiessen's Meter-gram Standard of 466Resistance, Matthiessen's Unit of 466Resistance, Meter-millimeter Unit of 466Resistance, Mil-foot Unit of 467Resistance, Non-essential 465, 467Resistance, Non-inductive 467Resistance of Human Body 467Resistance, Ohmic 394, 467Resistance, Reduced 467Resistance, Siemens' Unit of 467Resistance, Specific 467Resistance. Specific Conduction 467Resistance, Spurious 467Resistance, Steadying 468Resistance, Swiss Unit of 468Resistance, Thomson's Unit of 468Resistance to Sparking 490Resistance, True 467Resistance, Unit 468Resistance, Unit of, B. A. 78Resistance, Varley's 559Resistance, Varley's Unit of 468Resistance, Virtual 297Resistance, Weber's Absolute Unit 468Resolution of Forces 261Resonator, Electric 468-470Rest, Currents of 167Resultant 470Resultant Polarity 470Retardation 470Retardation of Phase 471Retentivity 471Retentivity, Magnetic 351Retort Carbon 471Return 471Return Circuit 125Return, Earth 203Return Stroke 55Reversal, Thermo-Electric 533Reverse Current Working 581Reverse-induced Current 163Reverser, Current 165Reversibility 471Reversible Bridge 472Reversing Key 316Reversing Switch 501Revivify 115Revolving Armature, Page's 47Rheochord 472Rheometer 472Rheomotor 472Rheophore 472Rheoscope 472Rheoscopic Frog 262Rheostat 472Rheostat Arm 472Rheostatic Machine 472Rheostat, Wheatstone's 472Rheotome 473Rheotrope 473Rhigolene 473Rhumbs 473Rhumkorff Coil 138, 473Ribbon Coil 138Ribbon Core 154Right-handed Screw Law 324Rigidity, Molecular 380, 473Ring, Ampere 30Ring Armature 48Ring. Collecting 139Ring Contact 473Ring Core 155Ring, Dynamo 200Ring, Faraday's 473Ring, Foundation 261Ring, Guard 282Ring, Pacinotti's 400Rings, Electric 392Rings, Nobili's 392Ring, Split, Commutator 141Roaring 474Rocker 474Rocker Arms 50, 474Rod, Bus 94Rod, Discharging 189Rod, Omnibus 94Roget's Spiral 474Rolling Armature 49Rosin 460Rotary Polarization, Magnetic 351Rotating Brush 91Rotating Field 256Rotation of Liquids, Electro-dynamic 474Rotation of Liquids, Electro-magnetic 475Rotatory Currents 167Rubber 102, 475Rubber, India 102Saddle Bracket 475Safety Catch 175Safety Cut Out 175Safety Device 475Safety Fuse 175, 475Safety Fuse, Plug, or Strip 475Sal Ammoniac Battery 69Salient Pole 426Salt 475Salt, Dronier's 192Salt or Sea-salt Battery 69Sand Battery 90Saturated 476Saturation, Magnetic 351Saw, Electric 476Scale, Fahrenheit 248Scale, Réaumur 450Scale, Tangent 502Schweigger's Multiplier 476Scratch Brushes 476Screen, Electric 476Screen, Magnetic 351Screen, Methven 376Screws or Posts, Binding 81Sealed, Hermetically 289Sea Salt or Salt Battery 69Secohm 288Second, Ampere- 30Secondary Actions 477Secondary Ampere-turns 31, 551Secondary Battery 70Secondary Battery, Efficiency of, Quantity 205Secondary Battery, Planté's 72Secondary Clock 127Secondary Current 166Secondary Generator 277, 477Secondary Magnet Poles 366Secondary, Movable 477Secondary Plates, Colors of 478Secondary Poles 478Secretion Current 166Section Trolley 549Sectioned Coils 138Seebeck Effect 478Segments 56Segments, Commutator 56Selenium 478Selenium Cell 478Selenium Eye 478Self-exciting Dynamo 201Self-induction 303Self-induction, Magnetic 352Self-induction, Unit of 304Self-repulsion 478Self-winding Electric Clock 128Semi-circular Deviation 181Semi-conductors 478Semi-incandescent Lamp 323Sender, Zinc 582Sensibility 479Sensitiveness, Angle of Maximum 479Separate Circuit Dynamo 201Separate Touch 359, 479Separate Touch, Magnetization by 359Separately Excited Dynamo 201, 479Separation of Electricities 479Separator 479Separator, Magnetic 352Series 479Series and Long Shunt Winding 579Series and Separate Coil Winding 579Series and Short Shunt Winding 580Series, Contact 147Series Dynamo 201Series, Electro-chemical 209Series, Electro motive 228Series, Electrostatic 235Series Motor 386Series, Multiple- 387Series-multiple 480Series, Thermo-electric 534Series Transformer 548Series Winding 579Service Conductors 480Serving 480Shackle 480Shadow, Electric 480Shadow, Molecular 480Shadow Photometer 414Sheath for Magnet Coils 481Sheath for Transformers 481Sheath, Induction 303Sheet Current 166Shell, Magnetic 352Shell, Strength of Magnetic 352Shellac 481Shellac Varnish 481Shield, Anti-magnetic 37Shield, Magnetic 351, 353Shielded 481S. H. M. 482Shock, Back, or Stroke of Lightning 55Shock, Break 482Shock, Electric 482Shock, Opening 482Shock, Static 482Short Circuit 482Short Circuit Working 482Short Fall Air Pumps 16Short Shunt Winding 579Shovel Electrodes 483Shower Bath, Electric 57Shunt 483Shunt Box 483Shunt Circuit 123, 126Shunt Dynamo 202Shunt, Electro-magnetic 483Shunt, Galvanometer 271, 483Shunt, Magnetic 353Shunt Motor 386Shunt. Multiplying Power of a 388Shunt Ratio 483Shunt Winding 580Shuttle Armature 49Shuttle Current 483Shuttle Winding 483, 580Side Flash 484Siemens and Halske's Battery 72Siemens' Differential Voltameter 564Siemens' Electro-dynamometer 212Siemens' Old Armature 49Siemens' Unit of Resistance 467Sighted Position 484Signaling, Velocity of 560Signals, Electro-pneumatic 231Signal, Telegraph 519Silent Discharge 187, 189, 206Silver 484Silver Bath 484Silver, German 277Silver Stripping Bath 484Silver Voltameter 565Simple Arc 39Simple Circuit 126Simple Harmonic Motion 486Simple Immersion 185Simple Magnet 366Simple Substitution 485Sims-Edison Torpedo 543Sine Curve 174, 485Sine Galvanometer 271Sine Law 486Sines, Curve of 173, 485Single Coil Dynamo 202Single Curb Working 581Single Fluid Theory 486Single Fluid Voltaic Cell 486Single Needle Telegraph 519Single Touch, Magnetization by 359Sinistrotorsal 486Sinuous Current 166Sinusoidal Curve 174, 485Siphon Recorder 452Sir William Thomson's Battery 72Skin Effect 486Skrivanow Battery 72Sled 486Sleeve, Joint 310Slide, Balance 374Slide Bridge 374Slide Meter Bridge 486Sliding Condenser 144Sliding-contact Key 316Sliding Resistance Box 463Slope, Lines of 330Smee's Battery 73S. N. Code 486Snap Switch 501Soaking-in-and-out 486Socket, Lamp 323Socket, Wall 572Soldering, Electric 487Solenoid 487Solenoid Ammeter 28Solenoidal Distribution of Magnetism 358Solenoidal Magnet 366Solid Earth 203Solutions, Battery, Chromic Acid 73Solution, Chutaux's 119Solution, Delaurier's 179Solution, Hittorf's 289Solution, Kookogey's 318Solution, Poggendorf's 421Solution, Striking 496Solution, Tissandier's 542Solution, Trouvé's 549Sonometer, Hughes' 488Sonorescence 488Sound, Characteristics of 114Sounder 488Sounders, Tin 542Sound, Quality of 444Sound Reading 489South Magnetic Fluid 356Space, Clearance 489Space, Crookes' Dark 489Space, Dark, Faraday's 249, 489Space, Faraday's Dark 249, 489Space, Inter-air 489Space, Interferric 489Span, Polar 424Span, Polar, Angle of the 32Spark Arrester 489Spark Coil 489Spark Discharge 189Spark, Duration of Electric 490Spark Gap 490Spark, Length of 490Spark Micrometer 470Spark Tube 491Sparking 490Sparking Distance 190Sparking, Lines or Points of Least 490Sparking, Resistance to 490Specific Conduction Resistance 467Specific Conductivity 145Specific Heat 286Specific Heat of Electricity 491Specific Inductive Capacity 103Specific Magnetization 361Specific Resistance 467Speech, Articulate 50Speed, Critical 157Spent Acid 491Spent Liquor 491Spherical Armature 49Spherical Candle Power 101Spherical Illuminating Power 296Sphygmophone 491Sphygmophone, Electric 491Spiders 491Spiral 492Spiral Battery 73Spiral, Roget's 474Spiral Winding 492Spirit Compass 143Splayed Joint 311Splice Box 492Split Battery 73Split Ring Commutator 141Spluttering 492Sponge, Platinum 419Spot, Grease 92Sprengel Pump 439Spring Ammeter 28Spring and Fibre Suspension 252Spring-contact 148Spring Control 492Spring Jack Cut-out 493Spurious Hall Effect 284Spurious Resistance 467Spurious Voltage 493Square Mil 379Square Wire 493Squares, Law of Inverse 323St. Elmo's Fire 494Staggering 493Standard Candle 101Standard Candle, German 99Standard, Harcourt's Pentane 406Standard, Methven 376Standard of Illuminating Power, Viole's 561Standard or Main Feeder 251Standard Quadrant 444Standard Resistance Coil 464Standard Voltaic Cell 109Standard Voltaic Cell, Daniell's 109Standard Voltaic Cell, Latimer Clark's. 110State, Electrotonic 493State, Nascent 389State of Matter, Fourth 261State, Passive 404State, Permanent 408Static Breeze 493Static Condenser, Armature of 46Static Electricity 493Static Hysteresis 295Static Induction, Magnetic 347Static Shock 482Station, Central 493Station, Distant 493Station, Home 493Station, Transforming 494Steadying Resistance 468Steel 494Steeling 494Steel Yard Ammeter 28Step-by-step Telegraph 506Step-by-step Telegraphy 494Step-down 494Step, Foot- 259Sticking 494Stool, Insulating 305Stopped Coil Electro-magnets 221Stopping Off 495Storage Battery 70Storage Battery Changing Switch 501Storage Battery, Planté's 72Storage Capacity 105, 495Storage of Electricity 495Storms, Electric 495Storms. Magnetic 353Strain 495Strain, Dielectric 183Strain, Magnetic 354Stranded Conductor Armature 49Stranded Core 155Stray Field 256, 495Stray Power 495Streamlets. Current 495Strength, Dielectric 183Strength of Magnetic Shell 352Stress 495Stress, Dielectric 496Stress, Electro-magnetic 219, 496Stress, Electrostatic 236, 496Stress, Energy of 241Stress, Magnetic 354Striae, Electric 496Striking Distance 496Striking Solution 496Stripping 496Stripping Bath 57Stripping Bath, Gold 279Stripping Bath, Silver 484Stroke, Back 55Stroke or Shock of Lightning, Back 55Stroke, Return 55Sub-branch 496Sub-main 496Sub-permanent Magnetism 358Substitution, Simple 485Subway, Electric 496Successive Temperatures, Law of 324Sucking Coil 182Sucking Magnet 366Sulphate of Lead Battery 66Sulphate of Mercury Battery 67Sulphating 497Sulphur Dioxide 497Sulphuric Acid 497Sulphuric Acid Voltameter 564Sulphurous Acid Gas 497Sunstroke, Electric 497Superficial Density, Electric 180Supersaturated, 497Supply, Isolated 309Surface 497Surface Density 498Surface, Equipotential 498Surface Leakage 498Surface Magnetization 356Surgical Electro-magnet 222Surging Discharge 188Surveyors' Compass 143Susceptibility, Magnetic 354, 359Suspension 498Suspension, Bifilar 498Suspension, Fibre 252Suspension, Knife Edge 317Suspension, Pivot 416Suspension, Spring and Fibre 252Suspension, Torsion 545Suspension Wire of Cable 97Swaging. Electric 499Swelling Current 167S. W. G. 499Swinburne Pump 440Swinging Earth 203Swinging or Pendulum Annunciator 35Swiss Unit of Resistance 468Switch 499Switch, Automatic 500Switch Board 500Switch Board, Multiple 387Switch Board, Trunking 550Switch, Break-down 88Switch, Changing 500Switch, Changing Over 500Switch, Circuit Changing 500Switch, Double Break 500Switch, Double Pole 500Switch Feeder 500Switch, Knife 501Switch, Knife Break 501Switch, Knife Edge 501Switch, Multiple 501Switch, Plug 420Switch, Pole Changing 501Switch, Reversing 501Switch, Snap 501Switch, Storage Battery Changing 501Switch, Three Way 501Switches, Distributing 190Symmer's Theory 191Sympathetic Vibration 501, 561System, Block 83System of Co-ordinates 150System, Tower 545T 501Tailing Current 501Tailings 501Talk, Cross 158Tamidine 502Tangent Galvanometer 272Tangent Law 502Tangent Positions of, Gauss 276Tangent Scale 502Tangentially Laminated Core 155Tank, Cable 97Tape, Insulating 305Tapper Key, Double 314Teazer 504Technica, Memoria, Ampére's 30Tee, Lead 504Teeth, Pacinotti 400Tel-autograph 504Tele-barometer, Electric 504Telegraph, A. B. C. 504Telegraph, Autographic 510Telegraph, Automatic 504Telegraph, Dial 505Telegraph, Double Needle 506Telegraph, Duplex 506Telegraph, Duplex, Bridge 506Telegraph, Duplex, Differential 507Telegraph Embosser 237Telegraph, Facsimile 510Telegraph, Harmonic Multiplex 510Telegraph. Hughes' 511Telegraph Insulator 306Telegraph Key 316Telegraph, Magneto-electric 512Telegraph, Morse 512Telegraph, Multiplex 514Telegraph, Single Needle 519Telegraph, Overhouse 515Telegraph Pole Brackets 515Telegraph, Printing 515Telegraph, Quadruplex 515Telegraph Repeater 518Telegraph Signal 519Telegraph, Step-by-step 506Telegraph, Wheatstone's, A. B. C. 521Telegraph. Writing 521Telegraphic Alphabet 19Telegraphic Code 130, 511Telegraphic Needle 389Telegraphic Register 454Telegraphy, Multiplex 388Telegraphy, Step-by-step 494Telemanometer, Electric 521Telemeter, Electric 521Telepherage 522Telephone 522Telephone, Bi- 524Telephone, Capillary 525Telephone, Carbon 525Telephone, Chemical 526Telephone, Electrostatic 526Telephone Exchange 246Telephone Induction Coil 137, 526Telephone, Reaction 527Telephone Record 451Telephone, Thermo-electric 527Telephone Tinnitus 542Telephotography 521Telephote 527Telescope, Reading 450Teleseme 527Tele-thermometer 527Terminal 529Terminal Pole 529Terminal Voltage 562Temperature, Absolute 8Temperature, Neutral 390Temperatures, Laws of Successive 324Tempering, Electric 527Temporary Magnetism or Magnetization 357Ten, Powers of 527Tension 529Tension, Disruptive 189Tension, Electric 529Terrestrial Magnetism 358Tetanus, Acoustic 529Tetrode Working 581Theatrophone 529Theory, Contact 148Theory, Double Fluid 191Theory, Franklin's 262Theory of Dimensions 184Theory of Light, Electro-magnetic 219Theory of Light, Maxwell's 369Theory of Magnetism, Ampére's 354Theory of Magnetism, Ewing's 356Theory of Magnetism, Hughes' 357Theory of Magnetism, Weber's 358Theory, Symmer's 191Therapeutic Electrode 210Therapeutics, Electro- 236Therm 529Thermaesthesiometer 530