The AMS does not provide abstracts of book reviews. You may download the entire review from the links below.
Full text of review: PDF This review is available free of charge.
Authors: J. G. Hagen and G. A. Fargis
Title: The photochronograph, and its application to star transits
Additional book information: Georgetown College Observatory. Georgetown, D. C., 1891. 4to, pp. 36.
Reviewer: Harold Jacoby
Journal: Bull. Amer. Math. Soc. 1 (1891), 44-46