Displacement Interferometry By the Aid of the Achromatic Fringes volume 3
Displacement Interferometry By the Aid of the Achromatic Fringes volume 3
Carl Barus
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2r = o. 37S cm. A = o. No cm. 2 R= 10. 3 cm. R' = 7. 0 cm. * = 45 An example of cycles obtained in this way (after initial loading) may here be given: Load 123 4 5 4 3 2 i kg. Io 4 AA/" o 6. 5 ii. O 12. 0 12. 5 10. 5 9. 0 7. 5 1. 5 cm. One may infer that below 2 kg. There is some dislocation, but very little is shown by the residual loop above 2 kg. Moreover, the loop is not a case of hysteresis, as is clear from the inverted march of values. Hence the mean value AA/YAP = o. Oooi6 cm. May here ...be accepted, from which =5. 5 Xio 11 may be computed. This result is too low; but with a micrometer reading to but io~ 4 cm. , limiting the displacement interferometer, a value even as good as this is hardly expected. It indicates the degree of deficient rigidity 62 DISPLACEMENT INTERFEROMETRY BY of the apparatus which is not adapted for brass rods as thick as this, as well as the sectional irregularity of stress. If x be the true micrometer displace- ment and x' that due to apparent yielding of the apparatus and sectional discrepancies, and if C is a constant and io 12 the modulus of brass, we may write (since AAf = #+#') cm.
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