The photochronograph and its applications
At head of title: Georgetown college observatory Contains six papers, each with special t.-p Preface signed: J. G. Hagen, S. J I. The photochronograph and its application to star transits, by G. A. Fargis. 1891.--II. The photochronograph applied to determinations of latitude, by G. A. Fargis. 1892.--III. The reflecting zenith telescope, by José Algué. 1893.--IV. The photographic zenith telescope, by G. A. Fargis. 1894.--V. The photochronograph applied to measures of double stars and planets, by G. A. Fargis. 1894.--VI. Suggestions regarding the application of the photochronograph, by J. T. Hedrick. 1894
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