Difference between revisions of "Page:ASC 1868 06 29 13-12, 12a.pdf/1"
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19, Bloomsbury Street,<lb/> | 19, Bloomsbury Street,<lb/> | ||
London. 2<unclear>0</unclear> June 1868<lb/> | London. 2<unclear>0</unclear> June 1868<lb/> |
Latest revision as of 18:40, 4 October 2020
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19, Bloomsbury Street,
London. 20 June 1868
W. C.
Revd Sir,
I am this day in receipt of your letter of the 24th which I hasten to reply to
It would appear that you have been using the eyepiece as a Huyghenian or negative instead of as a Ramsden or positive - the latter (A) requiring to be drawn out something like 3 inches from where you