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- W2065221372 abstract "Student's Observatory, Long. West Greenwich, 8h 9m 2s. 36, . N. Latitude, 37o 52' 22, Berkeley, May 15, 1891. Prof. E. S. Holden, Director Lick Observatory : Dear Sir. Yesterday afternoon I observed the first internal contact oi Mercury with the sun's disc. Mr. A. B. Pierce, class of '90, assisted me with the Fauth chronograph, the Howard mean time clock, the Negus sidereal chronometer and the battery and local circuits. Mr. E. P. HilBORN, '91, acted as Secretary. Mr. Joseph Le Conte, Jr., observed the transit through the three-inch alt-azimuth by Fauth & Co. Mr. Anson S. Blake, '91, observed with the two-inch finder of the equatorial removed to a stand in the open air. Messrs. Ross Morgan, '91, and L. W. Lloyd, '92, also assisted in the Observatory. I observed the transit with the 6}( -inch Fauth equatorial, objective by the late J. Byrne, of New York. The full aperture was used and a Herschelian prism deflected about 12% of the rays to a Huyghenian eye-piece of power 125 furnished with a colored glass sun-shade. The telescope was driven by clock-work and protected by an improvised umbrella screen. The weather and seeing were good and the sun's limb" @default.
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- W2065221372 date "1891-06-01" @default.
- W2065221372 modified "2023-10-14" @default.
- W2065221372 title "ERRATA IN WATSON'S THEORETICAL ASTRONOMY" @default.
- W2065221372 doi "https://doi.org/10.1086/120295" @default.
- W2065221372 hasPublicationYear "1891" @default.
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