Abstract
FOR the substantiation of changes on the surface of Mars, it is of paramount importance that the drawings to be compared should all have been made by the same person at the same telescope, under as nearly as possible the same atmospheric conditions. So much, at least, is fulfilled by the drawings referred to in this paper. For they were all made by Mr. Lowell at the same instrument, under the same general atmospheric conditions. Even the different eye-pieces used vary chiefly in a manner to minimise, if anything, and so emphasise the differences observed. For with increasing image the higher power used tends to decrease the contrast. The result is that it largely offsęts the difference in contrast due to nearer approach, and leaves simply a case of magnification, with the values untouched.
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Seasonal Changes on Mars.1. Nature 51, 259–261 (1895). https://doi.org/10.1038/051259b0
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DOI: https://doi.org/10.1038/051259b0