The Melbourne Telescope

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Jul 1872

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1872natur...6..241d&link_type=abstract

Nature, Volume 6, Issue 143, pp. 241 (1872).

Physics

Scientific paper

MR. ELLERY has been so good as to send me an enlargement of the lunar photograph taken with the great Melbourne telescope, to which you allude at p. 228, No. 142 of your Journal. This picture, Mr. Ellery tells me, was taken on the second evening of trial; it is very beautiful, although not so critically sharp as several I have obtained with my Newtonian equatorial of 13 in. aperture, and a little more than 10 ft. focal length. This sharpness, however, is a mere question of the shadiness of the atmosphere ; and I feel persuaded that pictures will be taken with the Melbourne telescope far surpassing any hitherto procured. In my telescope the focal image varies from I in. to 12/10in. in diameter, according to the distance of the moon from the earth. The primary picture of the Melbourne telescope (an enlargement of which has been sent to me) is 33/16 in. in diameter; hence the structure of the collodion and minute defects in it are of much less importance than when smaller instruments are used.

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