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 223
have been hazarded. M. Antoniadi hassought to account for it by maladjustment of focus. That itcannot be due to optical illusion or double refraction seemsquite certain; rather the twin canal appears to have in eachcase a real existence. The sketch on page 172 shows a portion of Mars not com-monly… … MARS AS SEEN AT THE LOWELL OBSERVATORY, ARIZONA16th August 1894, under fine atmospheric conditions {by Professor W. H. Pickering, withthe 18-inch Brashear telescope, -magnifying power 420) The scale is 73.-stys.7nn7 > that is, 1 millimetre — 73.5 kilometres•= 45! miles. The linear valueof 1…
Astronomy
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