The Polaris Vertical Circle Method of Determining Time and Azimuth.

Missouri: Stephens. pamphlet. 84pp. Large 4to, original gray printed wrappers; unopened. Columbia, Missouri: Stephens, 1905. Very good (+). very good(+).

Laws Observatory, University of Missouri, Bulletin No. 5. Seares' "principal contribution lay in the field of photographic photometry: he standardized the stellar magnitude system and extended it to include stars fainter than the eighteenth magnitude," DSB XII, p. 265.

Price: $50.00

Item #35398

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