Displacement Interferometry By the Aid of the Achromatic Fringes volume 4
Displacement Interferometry By the Aid of the Achromatic Fringes volume 4
Carl Barus
The book Displacement Interferometry By the Aid of the Achromatic Fringes volume 4 was written by author Carl Barus Here you can read free online of Displacement Interferometry By the Aid of the Achromatic Fringes volume 4 book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Displacement Interferometry By the Aid of the Achromatic Fringes volume 4 a good or bad book?
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. 8 . 6 5 8. 0 3-3 5-2 i-9 2-7 1. 7 63 24. Measurement of the thermal expansion, a. For this purpose the tube TT (fig. 40) is to be clean and empty, the nozzle p removed, and a long- stemmed thermometer passed from end to end of the tube, through the end p, as in figure 37. Externally the tube is surrounded by a coil of wire for electric heating and appropriately jacketed. Measurements made in this way with Carnegie Inst. Wash. Pub. No. 249, pp. 84-94, I 9 I 7- THE AID OF THE ACHROMATIC FRINGES.... 39 a brass tube are given in figures 38 and 39 and are quite satisfactory, if the tube is properly protected from loss by radiation. If for the steel tube a= lo^Xiz, equations (3) and (6) then give us or about 40 scale-parts of the ocular micrometer per degree of temperature. 25. Available liquids. It remains to select suitable liquids for experiment. For water at 27, a=io~ 6 X27, c=i, p=i, or dd/ 'dp = 0. 0019; for ethylic alcohol at about 18, a=io- 5 Xno, ^ = 0. 58, p = o. L jg, whence dd/ dp = 0.
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