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  1. J. Wash. Acad. Sci.,  5, pp. 35–41; 1915.

1915 (1)

J. Wash. Acad. Sci.,  5, pp. 35–41; 1915.

J. Wash. Acad. Sci. (1)

J. Wash. Acad. Sci.,  5, pp. 35–41; 1915.

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Figures (1)

Fig. 1
Fig. 1

Fig. 1A. Plan of new autocollimator showing arrangement of optical parts.