Abstract
VISIBILITY OF THE MARTIAN CANALS.—In Bulletin No. 12 of the Lowell Observatory Mr. Lowell extends and sums up the results recently outlined by him in a communication to the American Academy of Sciences under the title “The Cartouches of the Canals of Mars.” During the last opposition he made 372 drawings of the planet's visible surface on 143 nights, and by carefully examining these and eliminating all known extrinsic variations he secured sufficient data to enable him to plot a visibility curve for each canal, between January 19 and July 26, which he believes exhibits only the actual, intrinsic variability of the marking in question. This curve he calls the “cartouche” of that canal.
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Our Astronomical Column . Nature 70, 416 (1904). https://doi.org/10.1038/070416a0
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DOI: https://doi.org/10.1038/070416a0