The substitution of Newton rings for mechanical contact permits (a) locating the setting reliably within ±0.0002 mm and (b) elimination of errors due to weight of lens since the optical setting can be achieved before mechanical contact. Guild's original instrument is described; also a new model recently constructed.
REFERENCES
1.
2.
L. C. Eichner Instruments, Bloomfield, New Jersey.
3.
This drawing is reproduced through the courtesy of Mr. L. C. Eichner.
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© 1943 American Institute of Physics.
1943
American Institute of Physics
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