Electrical and scientific instruments and apparatus : november 20th, 1899 (1899)
Elmer G. Willyoung & Co · New York : E.G. Willyoung · leaf 38
ed the same as twice the tangent ofthe angle and hence, for not too large angles, the same as the angle itself. 33 LAMPS AND SCALES. We have devised a form of lamp and scale which is very substan-tial, convenient to use, and reasonable in price. A sharp black line isthrown in the middle of a round… … Fig. 33. W421() to W4213. W4210. Improved Liamp, Stand and Scale Grade B $17 00 Using incandescent lamp, , W4211. Same as W4210, but for oil lamp B 17 50 W4213. Same as W4310, but for gas burner B 17 00 READING TELESCOPES AND SCALES. These telescopes have been designed to fill the demand for an…
Electric apparatus and appliances · Equipment and supplies
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