Stars and telescopes; a hand-book of popular astronomy, founded on the 9th ed. of Lynn's Celestial motions (1899)
Todd, David P. (David Peck), 1855-1939, Lynn, William Thynne, 1835-1911. Celestial motions · Boston, Little, Brown and company · leaf 336
attention to these critical researches, de-termining many stellar parallaxes with high precision, and hiswork was ably continued at Dunsink for several years by SirRobert Ball. Their measures were made with the microme-ter (page 343), and the mathematical formulae requisite incalculating such… … Dr GILL S HELIOMETER AT CAPETOWN (Aperture, 6 inches. Built by Repsold of Hamburg in 1888, and chiefly used in deter-mining distance of Sun and stars. Instruments of this type in the hands of trainedobservers have given results of the highest precision yet reached in astronomical,measurement) 278…
Astronomy
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