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Sir, I have lately put in practice a method of improving the cross wires, that are made use of in astronomical telescopes, which has pleased me so much, that I'propose, in this letter, to give you an account of it, knowing that you are always warmly interested in the success of any thing of this nature.

XI. An improvement proposed in the cross wires of telescopes, by Dr. Wilson, of Glasgow. In a letter to the Astronomer Royal