Stars and telescopes; a hand-book of popular astronomy founded on the 9th ed. of Lynn's Celestial motions (1901)
Todd, David P. (David Peck), 1855-1939, Lynn, William Thynne, 1835-1911 · Boston, Little, Brown · leaf 217
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, ARIZONAitth August 1894, under fine atmospheric conditions (by Professor VV. H. Pickering, -withthe iS-inch Brashear telescope, magnifying power 420) The scale is 73,i!bs.!T!T5 . that is, 1 millimetre = 73.5 kilomelres= 45$ *«//«. 77t* linear valueof 1 second…
Astronomy
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