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(1) G. W. B. asks: 1. What kind of cement used, and how to cement gum face on band saws? A. Ordinary rubber cement, such as you can purchase at any of the rubber stores, will answer your purpose. 2. Is there anything to be put in glue to prevent moisture from disturbing the joints in patterns? A. A little bichromate of potash put into your glue will render it insoluble, after exposure to light. 3. Is there anything to prevent shellac used for patterns from getting dark before using after it is mixed some time? A. We know of no way to prevent this.
(1) G. W. B. asks: 1. What kind of cement used, and how to cement gum face on band saws? A. Ordinary rubber cement, such as you can purchase at any of the rubber stores, will answer your purpose. 2. Is there anything to be put in glue to prevent moisture from disturbing the joints in patterns? A. A little bichromate of potash put into your glue will render it insoluble, after exposure to light. 3. Is there anything to prevent shellac used for patterns from getting dark before using after it is mixed some time? A. We know of no way to prevent this.
(2) W. S. C.—In closed circuits for steam heating, the pressure of the steam along the flow pipes and in coils in well arranged systems is so nearly equalized with the pressure in the boiler, that it requires but small elevation of the water of condensation in the return pipe above the water level in the boiler to allow of its return by gravity. In this system all of the radiators should be not less than from 1 to 5 feet above the water level in the boiler, according to the complication and extent of the circuit. The air is discharged at the radiators, and no waste of water is necessary.
(2) W. S. C.—In closed circuits for steam heating, the pressure of the steam along the flow pipes and in coils in well arranged systems is so nearly equalized with the pressure in the boiler, that it requires but small elevation of the water of condensation in the return pipe above the water level in the boiler to allow of its return by gravity. In this system all of the radiators should be not less than from 1 to 5 feet above the water level in the boiler, according to the complication and extent of the circuit. The air is discharged at the radiators, and no waste of water is necessary.
(3) E. H. S.—Coal tar alone with gravel and sand for sidewalks does not dry well. Asphaltum with equal parts of coal tar melted together and sprinkled upon the mixed sand and gravel that has been made hot upon an iron plate (the mixing to be done in a large pan of iron), putting no more asphalt and tar upon the sand and gravel than will just make it stick together; then dump into place while hot, spread quickly, and beat level with a ram or heavy roller. Dust over the surface with fine sand before rolling or beating, to prevent the material from sticking to the roller or beater. This operation requires a little care and experience as to just the amount of asphalt and tar for a given measure of sand and gravel, and also for the proportions of sand and gravel required to make the best pavement. Sometimes a thin bed of broken stone is laid as a foundation. Also a thin bed of coarse gravel is sometimes spread before dumping the hot mixture.
(3) E. H. S.—Coal tar alone with gravel and sand for sidewalks does not dry well. Asphaltum with equal parts of coal tar melted together and sprinkled upon the mixed sand and gravel that has been made hot upon an iron plate (the mixing to be done in a large pan of iron), putting no more asphalt and tar upon the sand and gravel than will just make it stick together; then dump into place while hot, spread quickly, and beat level with a ram or heavy roller. Dust over the surface with fine sand before rolling or beating, to prevent the material from sticking to the roller or beater. This operation requires a little care and experience as to just the amount of asphalt and tar for a given measure of sand and gravel, and also for the proportions of sand and gravel required to make the best pavement. Sometimes a thin bed of broken stone is laid as a foundation. Also a thin bed of coarse gravel is sometimes spread before dumping the hot mixture.
(4) J. C.—A first class ice boat, sailing on first class ice, will sail from three to four times faster than the wind that drives the boat. For example, a wind having a velocity of fifteen miles an hour will drive the boat at the rate of from forty to sixty miles an hour.
(4) J. C.—A first class ice boat, sailing on first class ice, will sail from three to four times faster than the wind that drives the boat. For example, a wind having a velocity of fifteen miles an hour will drive the boat at the rate of from forty to sixty miles an hour.
(5) T. H. G. writes: I have a mahogany table which has been varnished and has ink spots on it. 1. By what means can I get the varnish and ink off, in order to rub on an oil finish? A. The ink spots can be washed off with water and the varnish with alcohol. 2. What is best to polish carved brass? A. Polish with rotten stone and oil, alcohol, or spirits of turpentine. 3. What will remove water stains from polished marble? A. Mix quicklime with strong lye,
(5) T. H. G. writes: I have a mahogany table which has been varnished and has ink spots on it. 1. By what means can I get the varnish and ink off, in order to rub on an oil finish? A. The ink spots can be washed off with water and the varnish with alcohol. 2. What is best to polish carved brass? A. Polish with rotten stone and oil, alcohol, or spirits of turpentine. 3. What will remove water stains from polished marble? A. Mix quicklime with strong lye,
(Continued on pagex.)
In connection with the publication of theBuilding Edition of the Scientific American, Messrs. Munn & Co. furnish Plans and Specifications for Buildings of every kind, including Public Buildings, Churches, Schools, Stores, Dwellings, Carriage Houses, Barns, etc. In this work they are assisted by able and experienced architects.
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Any person having a new invention may, without charge, consult MUNN & CO., Scientific American Office, 361 Broadway, New York, for advice how to obtain a Patent or Caveat. Our Hand Book of Instructions relating to Patents sent free.
Practical Working Drawingsof machinery made by A. K. Mansfield & Co., 280 Broadway, N. Y. Life‐long mechanics. One formerly R. R. supt. M. P. Important references. Work guaranteed. Correspondence invited.
For Sale—22 unbound volumesScientific American, of old dates. Also a lot of odd numbers, in good order. For a descriptive list address I. R. Hudson, 212 East 14th St., New York.
All kinds wood engraving. Perfect; lowest rate; sell engr. tools, mate’l, machs. N. H. Taylor, Wyandotte, Kan.
Portable grinding mills. Chas. Kaestner & Co., Chicago, Ill.
Engines and boilers. Chas. Kaestner & Co., Chicago, Ill.
For Sale—The following braiding machines: 2 nine carriers, 1 twelve carriers, 2 thirteen carriers, 1 sixteen carriers, 1 twenty carriers, 1 twenty‐one carriers. Also three looms, 24 and 30 shuttles. All the above will be sold cheap. Raymold & Whitlock, 99 Fourth Ave., N. Y.
Wanted—New invention or novelty for the English market by a first‐class London house, having a large connection among shippers, warehousemen, drapers, etc. Address “Everclean,” 100 Wood St., London, England.
Lacquers.—Zapon, Brilliantine, Brassoline, Opaline, and other lacquers and special varnishes.Brilliant, hard, durable.Send for catalogue. The Fred’k Crane Chemical Co., Short Hills, N. J. N. Y. agent, Horace Van Sands, 733 Broadway.
For the best and cheapest 4 Horse Engine, address Peter Walrath, Chittenango, N. Y.
Perforated metals of all kinds for all purposes. The Robert Aitchison Perforated Metal Co., Chicago, Ill.
For the latest improved diamond prospecting drills, address the M. C. Bullock Mfg. Co., 138 Jackson St., Chicago, Ill.
TheRailroad Gazette, handsomely illustrated, published weekly, at 73 Broadway, New York. Specimen copies free. Send for catalogue of railroad books.
The Knowles Steam Pump Works, 113 Federal St., Boston, and 93 Liberty St., New York, have just issued a new catalogue, in which are many new and improved forms of Pumping Machinery of the single and duplex, steam and power type. This catalogue will be mailed free of charge on application.
Link Beltingand Wheels. Link Belt M. Co., Chicago.
Presses & Dies. Ferracute Mach. Co., Bridgeton, N. J.
Nickel Plating.—Sole manufacturers cast nickel anodes, pure nickel salts, polishing compositions, etc. $100 “Little Wonder.” A perfect Electro Plating Machine. Sole manufacturers of the new Dip Lacquer Kristaline. Complete outfit for plating, etc. Hanson, Van Winkle & Co., Newark, N. J., and 92 and 94 Liberty St., New York.
Iron Planer, Lathe, Drill, and other machine tools of modern design. New Haven Mfg. Co., New Haven, Conn.
Supplement Catalogue.—Persons in pursuit of information of any special engineering, mechanical, or scientific subject, can have catalogue of contents of theScientific American Supplementsent to them free. TheSupplementcontains lengthy articles embracing the whole range of engineering, mechanics, and physical science. Address Munn & Co., Publishers, New York.
The Holly Manufacturing Co., of Lockport, N. Y., will send their pamphlet, describing water works machinery, and containing reports of tests, on application.
Curtis Pressure Regulator and Steam Trap. See p. 301.
Planing and Matching Machines. All kinds Wood Working Machinery. C. B. Rogers & Co., Norwich, Conn.
For best leather belting and lace leather, including Hercules, see Page Belting Co.’s adv., p. 318.
Iron, Steel, and Copper Drop Forgings of every description. Billings & Spencer Co., Hartford, Conn.
Paint mills. Chas. Kaestner & Co., Chicago, Ill.
Pat. Geared Scroll Chucks, with 3 pinions, sold at same prices as common chucks by Cushman Chuck Co., Hartford, Conn.
Steam Hammers, Improved Hydraulic Jacks, and Tube Expanders. R. Dudgeon, 24 Columbia St., New York.
60,000Emerson’s1887 ☞ Book of superior saws, with Supplement, sent free to all Sawyers and Lumbermen. Address Emerson, Smith & Co., Limited, Beaver Falls, Pa., U. S. A.
Safety Elevators, steam and belt power; quick and smooth. D. Frisbie & Co., 112 Liberty St., New York.
“How to Keep Boilers Clean.” Send your address for free 88 page book. Jas. C. Hotchkiss, 120 Liberty St., N. Y.
Pays well on Small Investment.—Stereopticons, Magic Lanterns, and Views illustrating every subject for public exhibitions. Lanterns for colleges, Sunday schools, and home amusements. 152 page illustrated catalogue free. McAllister, Manufacturing Optician, 49 Nassau St., N. Y.
Ax handle and spoke lathes. Railway cutting off saw machines. Rollstone Machine Co., Fitchburg, Mass.
Best belt hooks are Talcott’s. Providence, R. I.