Elementary treatise on physics experimental and applied for the use of colleges and schools (1890)
Ganot, A. (Adolphe), 1804-1887, Atkinson, E. (Edmund) · New York : W. Wood · leaf 565
Fig. 532- A micrometer is formed thus :—A scale of 250 milli-metres is divided with great exactness into 25 equal parts. A photographic taken, reduced to 11; millimetres. The into 25 equal parts,metres is divided wnegative on glass of this scale -576 J Spectroscope. 547 … •■g- 533- negative is taken because then the scale is light on a dark ground. Thescale is then placed at m in the principal focus of the lens e ; conse-quently, when the scale is lighted by the candle F, the rays emitted from itleave the lens e in parallel pencils ; a portion of these, being…
Physics
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