An Eyepiece Interferometer

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Abstract
An eyepiece interferometer is described, intended primarily for the observation of close double stars. Some of the more significant features of the instrument are :- 1. The interferometer unit is complete in itself, and only requires a collimator unit to adapt it to any telescope. 2. It is of convenient size, with an over-all length of approximately 5 inches. 3. As the slits are located at a pupil in a collimated beam the instrument is not sensitive to reasonable displacements of the star from the axis, nor does the slit constant depend critically on the location of the slit plane. 4. It may be “twirled” very rapidly between finger and thumb, so that a scanning procedure may be employed, of great value in eliminating spurious minima due to poor seeing. 5. The slit separation may be varied with the touch of a finger. 6. The star may be examined with full aperture at will.

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