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  1. A stressed glass plate is sometimes employed as a substitute for the Brace mica strip and some exceptional claims made in regard to its sensibility. The mechanical difficulties attendant upon the production of a uniform field and vanishing dividing line are, relative to the mica strip, insuperable, so that it is difficult to conceive that the stressed plate should be preferred by any observer who has had experience with a Brace half-shade of variable azimuth.
  2. Tool, A. Q., Phys. Rev., 31, p. 1; 1910.
  3. Instrument makers will be furnished, on application to the Bureau of Standards, with blueprints giving details of construction. The drawings were made by Mr. F. A. Case of the Bureau, and the instrument constructed in the instrument shop by Mr. H. C. Wunder.
  4. Stokes, C. G., Phil. Mag. (4), 2, p. 420, (1851).
  5. A quartz plate, of known rotatory dispersion, which can be inserted in the compensator tube, is a convenient adjunct for determining the wave length of the light used.
  6. This focus leaves, at best, much to be desired. It needs therefore the most careful adjustment laterally and alignment of the nicol partition, as provided. A minimum length of nicol is also of importance.
  7. R designates the "retarded" and A the "accelerated" component.
  8. Tuckerman, L. B., "Doubly Refracting Plates and Elliptic Analyzers," Univ. of Neb. Studies IX; April 1909.
  9. Coll. Sci. Papers I p 68.
  10. Loc. cit.

Stokes, C. G.

Stokes, C. G., Phil. Mag. (4), 2, p. 420, (1851).

Tuckerman, Tuckerman, L. B.

Tuckerman, L. B., "Doubly Refracting Plates and Elliptic Analyzers," Univ. of Neb. Studies IX; April 1909.

Other (10)

A stressed glass plate is sometimes employed as a substitute for the Brace mica strip and some exceptional claims made in regard to its sensibility. The mechanical difficulties attendant upon the production of a uniform field and vanishing dividing line are, relative to the mica strip, insuperable, so that it is difficult to conceive that the stressed plate should be preferred by any observer who has had experience with a Brace half-shade of variable azimuth.

Tool, A. Q., Phys. Rev., 31, p. 1; 1910.

Instrument makers will be furnished, on application to the Bureau of Standards, with blueprints giving details of construction. The drawings were made by Mr. F. A. Case of the Bureau, and the instrument constructed in the instrument shop by Mr. H. C. Wunder.

Stokes, C. G., Phil. Mag. (4), 2, p. 420, (1851).

A quartz plate, of known rotatory dispersion, which can be inserted in the compensator tube, is a convenient adjunct for determining the wave length of the light used.

This focus leaves, at best, much to be desired. It needs therefore the most careful adjustment laterally and alignment of the nicol partition, as provided. A minimum length of nicol is also of importance.

R designates the "retarded" and A the "accelerated" component.

Tuckerman, L. B., "Doubly Refracting Plates and Elliptic Analyzers," Univ. of Neb. Studies IX; April 1909.

Coll. Sci. Papers I p 68.

Loc. cit.

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