The BELMONTYLE OIL

Prevents Rust, Tarnish, etc., on Firearms, Machinery, Tools, Cutlery,

Safes, Saws, Skates, Stoves, Hardware, etc., without injury to the

polish. In use over 10 years. Highest Testimonials. Samples 50 cents,

three for $1.00, sent free of expressage. Send for circular.

BELMONTYLE OIL CO., SOLE MANUFACTURERS, 150 Front Street, New York.

* * * * *

CARNEGIE BROS & CO UNION IRON MILLS PITTSBURGH PA WROUGHT IRON BEAMS

CHANNELS TEES & ANGLES

The attention of Architects, Engineers, and Builders is called to the

great decline in prices of wrought STRUCTURAL IRON. It is believed that,

were owners fully aware of the small difference in cost which now exists

between iron and wood, the former, in many cases, would be adopted,

thereby saving _insurance_ and avoiding all risk of _interruption_ to

_business_ in consequence of fire. Book of detailed information

furnished to Architects, Engineers, and Builders, on application.

* * * * *

[Illustration]

MICROSCOPES, TELESCOPES, FIELD GLASSES, MAGIC LANTERNS, ANEROID

BAROMETERS, SPECTROSCOPES, DRAWING INSTRUMENTS, PHILOSOPHICAL & CHEMICAL

APPARATUS.

Catalogues as follows sent on application: Part 1, Mathematical

Instruments, 162 pp.; Part 2, Optical Instruments, 186 pp.; Part 3,

Magic Lanterns, 112 pp.; Part 4, Philosophical and Chemical Apparatus,

160 pp. JAMES W. QUEEN & CO. 924 Chestnut St., Philadelphia, Pa.

* * * * *

"RELIABLE"

Engines a complete success. Prices still 40 per cent. below those of

other makers. Unequaled for efficiency, simplicity, and durability.

Prices from $250 for 10 H. P., to $400 for 30 H. P. All complete, with

Governor, Pump, and Heater. Address, for circular,

HEALD, SISCO & CO., Baldwinsville, N. Y.

* * * * *

Scientific American, Volume XLIII., No. 25, December 18, 1880 A Weekly Journal of Practical Information, Art, Science, Mechanics, Chemistry, and Manufactures. · 第 123 / 165 题