LESSON FOURTEEN. THE WIRELESS COIL.The induction coil used for wireless telegraph purposes differs from the ordinary coil commonly employed in the laboratory in that it is usually built in a more substantial manner and gives a heavier, more powerful discharge from the secondary.Induction coils of this type are usually enclosed in a strong wooden case filled with insulating compound and are sometimes termed box coils. They are fitted with an interrupter arranged to give a very long period of "make" and a short "break."Coils giving sparks greater than six inches in length are usually provided with an independent interrupter which may be one of several types.Fig. 30. Wireless Spark Coil.Fig. 30. Wireless Spark Coil.The ordinary independent interrupter consists of the usual form of interrupter, but is operated by the magnetism of a separate electromagnet in place of that of the coil primary itself. An independent interrupter of this type is usually provided with screws for adjusting the speed, and the duration of make and break.FIG. 31. Independent Interrupter.FIG. 31. Independent Interrupter.The Mercury Turbine form of interrupter is a very unsuccessful type in which a stream of mercury is made to play against a number of saw-shaped metal teeth. A spiral worm terminating in a nozzle-at the top is rapidly revolved by an electric motor. The lower end of the tubular worm dips into a mercury reservoir so that when the spiral is revolved, the mercury rises in the tube by centrifugal action and is thrown out from the upper end in the form of a jet.When the revolving jet strikes one of the metal teeth the circuit is made and when it passes between it is broken. Raising and lowering the saw teeth so that the mercury strikes either the lower or upper part varies the ratio of time of the make and break.FIG. 32. Electrolytic Interrupter.FIG. 32. Electrolytic Interrupter.The electrolytic interrupter consists of a cathode or negative electrode of sheet lead immersed in diluted sulphuric acid and an anode composed of a piece of platinum wire placed in a porcelain tube and projecting through a small hole in the bottom, so that only a very small portion of the wire is exposed to contact with the liquid. When a strong electric current is passed through the acid electrolyte, the current is very rapidly interrupted by the formation of gases on the small platinum electrode. The number of breaks per second possible with an electrolytic interrupter is extremely high. A potential of at least 40 volts is required to operate such an interrupter, however.
LESSON FOURTEEN. THE WIRELESS COIL.The induction coil used for wireless telegraph purposes differs from the ordinary coil commonly employed in the laboratory in that it is usually built in a more substantial manner and gives a heavier, more powerful discharge from the secondary.Induction coils of this type are usually enclosed in a strong wooden case filled with insulating compound and are sometimes termed box coils. They are fitted with an interrupter arranged to give a very long period of "make" and a short "break."Coils giving sparks greater than six inches in length are usually provided with an independent interrupter which may be one of several types.Fig. 30. Wireless Spark Coil.Fig. 30. Wireless Spark Coil.The ordinary independent interrupter consists of the usual form of interrupter, but is operated by the magnetism of a separate electromagnet in place of that of the coil primary itself. An independent interrupter of this type is usually provided with screws for adjusting the speed, and the duration of make and break.FIG. 31. Independent Interrupter.FIG. 31. Independent Interrupter.The Mercury Turbine form of interrupter is a very unsuccessful type in which a stream of mercury is made to play against a number of saw-shaped metal teeth. A spiral worm terminating in a nozzle-at the top is rapidly revolved by an electric motor. The lower end of the tubular worm dips into a mercury reservoir so that when the spiral is revolved, the mercury rises in the tube by centrifugal action and is thrown out from the upper end in the form of a jet.When the revolving jet strikes one of the metal teeth the circuit is made and when it passes between it is broken. Raising and lowering the saw teeth so that the mercury strikes either the lower or upper part varies the ratio of time of the make and break.FIG. 32. Electrolytic Interrupter.FIG. 32. Electrolytic Interrupter.The electrolytic interrupter consists of a cathode or negative electrode of sheet lead immersed in diluted sulphuric acid and an anode composed of a piece of platinum wire placed in a porcelain tube and projecting through a small hole in the bottom, so that only a very small portion of the wire is exposed to contact with the liquid. When a strong electric current is passed through the acid electrolyte, the current is very rapidly interrupted by the formation of gases on the small platinum electrode. The number of breaks per second possible with an electrolytic interrupter is extremely high. A potential of at least 40 volts is required to operate such an interrupter, however.
LESSON FOURTEEN. THE WIRELESS COIL.The induction coil used for wireless telegraph purposes differs from the ordinary coil commonly employed in the laboratory in that it is usually built in a more substantial manner and gives a heavier, more powerful discharge from the secondary.Induction coils of this type are usually enclosed in a strong wooden case filled with insulating compound and are sometimes termed box coils. They are fitted with an interrupter arranged to give a very long period of "make" and a short "break."Coils giving sparks greater than six inches in length are usually provided with an independent interrupter which may be one of several types.Fig. 30. Wireless Spark Coil.Fig. 30. Wireless Spark Coil.The ordinary independent interrupter consists of the usual form of interrupter, but is operated by the magnetism of a separate electromagnet in place of that of the coil primary itself. An independent interrupter of this type is usually provided with screws for adjusting the speed, and the duration of make and break.FIG. 31. Independent Interrupter.FIG. 31. Independent Interrupter.The Mercury Turbine form of interrupter is a very unsuccessful type in which a stream of mercury is made to play against a number of saw-shaped metal teeth. A spiral worm terminating in a nozzle-at the top is rapidly revolved by an electric motor. The lower end of the tubular worm dips into a mercury reservoir so that when the spiral is revolved, the mercury rises in the tube by centrifugal action and is thrown out from the upper end in the form of a jet.When the revolving jet strikes one of the metal teeth the circuit is made and when it passes between it is broken. Raising and lowering the saw teeth so that the mercury strikes either the lower or upper part varies the ratio of time of the make and break.FIG. 32. Electrolytic Interrupter.FIG. 32. Electrolytic Interrupter.The electrolytic interrupter consists of a cathode or negative electrode of sheet lead immersed in diluted sulphuric acid and an anode composed of a piece of platinum wire placed in a porcelain tube and projecting through a small hole in the bottom, so that only a very small portion of the wire is exposed to contact with the liquid. When a strong electric current is passed through the acid electrolyte, the current is very rapidly interrupted by the formation of gases on the small platinum electrode. The number of breaks per second possible with an electrolytic interrupter is extremely high. A potential of at least 40 volts is required to operate such an interrupter, however.
The induction coil used for wireless telegraph purposes differs from the ordinary coil commonly employed in the laboratory in that it is usually built in a more substantial manner and gives a heavier, more powerful discharge from the secondary.
Induction coils of this type are usually enclosed in a strong wooden case filled with insulating compound and are sometimes termed box coils. They are fitted with an interrupter arranged to give a very long period of "make" and a short "break."
Coils giving sparks greater than six inches in length are usually provided with an independent interrupter which may be one of several types.
Fig. 30. Wireless Spark Coil.Fig. 30. Wireless Spark Coil.
Fig. 30. Wireless Spark Coil.
The ordinary independent interrupter consists of the usual form of interrupter, but is operated by the magnetism of a separate electromagnet in place of that of the coil primary itself. An independent interrupter of this type is usually provided with screws for adjusting the speed, and the duration of make and break.
FIG. 31. Independent Interrupter.FIG. 31. Independent Interrupter.
FIG. 31. Independent Interrupter.
The Mercury Turbine form of interrupter is a very unsuccessful type in which a stream of mercury is made to play against a number of saw-shaped metal teeth. A spiral worm terminating in a nozzle-at the top is rapidly revolved by an electric motor. The lower end of the tubular worm dips into a mercury reservoir so that when the spiral is revolved, the mercury rises in the tube by centrifugal action and is thrown out from the upper end in the form of a jet.
When the revolving jet strikes one of the metal teeth the circuit is made and when it passes between it is broken. Raising and lowering the saw teeth so that the mercury strikes either the lower or upper part varies the ratio of time of the make and break.
FIG. 32. Electrolytic Interrupter.FIG. 32. Electrolytic Interrupter.
FIG. 32. Electrolytic Interrupter.
The electrolytic interrupter consists of a cathode or negative electrode of sheet lead immersed in diluted sulphuric acid and an anode composed of a piece of platinum wire placed in a porcelain tube and projecting through a small hole in the bottom, so that only a very small portion of the wire is exposed to contact with the liquid. When a strong electric current is passed through the acid electrolyte, the current is very rapidly interrupted by the formation of gases on the small platinum electrode. The number of breaks per second possible with an electrolytic interrupter is extremely high. A potential of at least 40 volts is required to operate such an interrupter, however.