(Entered at the Post Office of New York, N. Y., as Second Class Matter)

A WEEKLY JOURNAL OF PRACTICAL INFORMATION, ART, SCIENCE, MECHANICS, CHEMISTRY, AND MANUFACTURES.

Vol. XLIII., No. 25.
[New Series.]
$3.20 per Annum.
[POSTAGE PREPAID.]

NEW YORK, DECEMBER 18, 1880.


Contents.

(Illustrated articles are marked with an asterisk.)

[Air engine, new]385
[Amateur mechanics*]390
[American Institute of Architects]389
[Architects, American Institute]389
[Arctic winter, characteristics of]393
[Aquarium (29)]395
[Balance attach. for valves*]386
[Band saw, hand power*]387
[Barometer, chemical (15)]394
[Battery, Leclanche, to renew (13)]394
[Beetle, Hercules, the*]391
[Belts, capacity of (12)]394
[Business colleges*][383], 388
[Carbons, to solder (20)]395
[Chinese women's feet*]393
[Chisels, tempering]389
[Colleges, business*][383], 388
[Engine, air, new]385
[Engine, steam, single-acting*]390
[Eruption of Mauna Loa]385
[Exhibition of bathing appliances]393
[Feet, Chinese women's*]393
[Fires—causes and prevention]384
[Glass spinning and weaving]385
[Gun, submarine, new]387
[Harbor at Montreal, the]387
[Hercules beetle, the*]391
[Horse-power of turbines (12)]394
[Ice at high temperatures]393
[Ice, removing from railroads*]387
[Induction coil for transmitter (14)]394
[Induction coil, small (26)]395
[Invention, schools of]393
[Inventions, miscellaneous]390
[Inventions, recent]387
[Knots, learning to tie]392
[Leaves, variegation of]392
[Light, what is?]384
[London underground railway]389
[Mantis, the embrace of the]391
[Mechanics, amateur*]390
[Montreal, the harbor at]387
[Noise, to deaden (9)]394
[Nut, safety, improved*]386
[Packard's Business College*][383], 388
[Patents, decisions relating to]393
[Petroleum prospects]386
[Photos, to color (10)]394
[Poultry raising, mechanical]391
[Railway, underground, London]389
[Safety nut, improved*]386
[Safety valve, improved*]386
[Schools of invention]393
[Screw-cutting foot lathe (11)]394
[Steamers, Collins line of]393
[Steam heating, return pipe (17)]394
[Steel, to tin (28)]395
[Submarine gun, new]387
[Sun dial, to adjust (27)]395
[Telegraph insulator, new*]387
[Telegraph wires underground]385
[Valve, safety, improved*]386
[Valves, balance attachment for*]386
[Vanilla, cinnamon, cocoanut]392
[Vennor's winter predictions]389
[Vessels, sunken, raising]386
[Winter predictions, Vennor's]389
[Zinc, to amalgamate (23)]395