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Today in history - Alvan Clark patents telescope
Alvan Clark patents telescope - 11.11.1851
TVs > Today in History > November 11 - Alvan Clark patents telescope
Alvan Clark patents telescope - 11.11.1851
Today in history - November 11, 1851



As a telescope maker his reputation is world wide. when Dom Pedro, of Brazil, visited this country some years ago he said there were three persons in Cambridge whom he wanted much to see. These were Longfellow, Professor Agassiz and Mr. Alvan Clark.

He was more than 40 when he became interested in telescopes. Assisted by his two sons he afterward produced the most accurate and the two largest instruments in the world. Mr. Clark was the first optician in the United States to make achromatic lenses, each completed lens being composed of two pieces, one of crown and the other of flint glass, and he invented numerous improvements in telescopes and their manufacture, including the double eye piece, an ingenious method of measuring small celestial arcs.


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