. Carnegie Institution of Washington publication. THE AID OF THE ACHROMATIC FRINGES. 15 The fringes found without difficulty were small, though adequate for the purpose. Measurements were made in cycles, care being taken to repeatedly tap the movable parts of the apparatus before each reading, and these came out remarkably smoothly at once. The first results were (initial load about 2 kg.): No. of turns of screw, 7*1234543 2 i io3XAA/" cm. These data are also given at a, figure 9. The outgoing branch is nearly straight and regular, though
. Carnegie Institution of Washington publication. THE AID OF THE ACHROMATIC FRINGES. 15 The fringes found without difficulty were small, though adequate for the purpose. Measurements were made in cycles, care being taken to repeatedly tap the movable parts of the apparatus before each reading, and these came out remarkably smoothly at once. The first results were (initial load about 2 kg.): No. of turns of screw, 7*1234543 2 i io3XAA/" cm. These data are also given at a, figure 9. The outgoing branch is nearly straight and regular, though the first observation was lost. The return branch is less regular, as would be expected, but the departures lie within 5 X io~4 cm. If we take the differences between observations n = 3 turns apart, in the out- going series the results would be io3AAT 10 -10 j Loads about 6-45 2-5 4-6 cm. 5-8 kg. The rod therefore grows steadily more rigid as the load increases, as shown at b, figure 9, a result also to be anticipated. Of hysteresis there is no certain indication, since the higher results in the return may be otherwise explained. If the means of advance and return series had been taken, the values of io3A7V. would have been , , , and their mean difference from the above is within the errors of the screw micrometer reading to io-4 cm. TABLET.—Hard rubber rod. £= cm. .4 = cm2. £ = Initial load about 2 kg. Additional load about kg. per turn (n = i). n io*N lo'Ae (« = i) «=3 io-10£ n ** «=3 io-10£ o i 2 3 4 9-4 13-3 30 28 26 26 26 6. 20 5-85 5-70 5-15 2-73 *7 6 5 4 3 15-9 18 22 24 24 24. 5-55 5-85 6-55 2-54 s IS- 2 2 6 17. 1 26 I 24 7 O 5-5 * Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illu
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