Practical observations on telescopes.

  • Kitchiner, William, 1775?-1827.
Date:
1815
Catalogue details

Licence: Public Domain Mark

Credit: Practical observations on telescopes. Source: Wellcome Collection.

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    achromatic telescope, would render it a much more universal and powerful instru¬ ment than it is, as fitted up in the usual way with only two or three powers. But I should never have discovered to what ex¬ tent these sight-invigorating tubes can be agreeably and usefully varied, but for the assistance of an ingenious and liberal friend. Justice requires me to say, I have always found him equally able and willing to con¬ struct for me the various eye-pieces I un¬ avoidably wanted, while making the nume¬ rous experiments which were absolutely necessary for ascertaining the precise limits of useful magnifying power, how best pro¬ duced, and the most convenient mode of applying it to refracting telescopes. These, I am happy to find, may be made to carry as much power as the rapid diurnal motion and atmosphere of the earth will permit us to employ ; and, for examining double stars, I think are more agreeable instruments than the reflecting telescopes. I had a Newtonian reflector made for me by Mr. Cary, optician and mathematical