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Objective prism and 4 lenses from the 24-inch Bruce doublet telescop, by Alvan Clark & Sons, Cambridge MA, 1893 - Putnam Gallery - Harvard University - DSC08071
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Published by:
Creazilla
Author:
Daderot
Source:
commons.wikimedia.org
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self-published work
cc-pd-mark
author died more than 100 years ago public domain images
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telescopes in the harvard collection of historical scientific instruments
telescopes containing lenses ground by alvan clark & sons
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