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American Philosophical Society
Long Route to the Invention of the Telescope: (Transactions 98-5)
After the telescope became known in 1608-1609, a number of people in widely separate locations claimed that they had such a device long before the announcement came from The Hague; in the summer of 1608, no one had a telescope, in the summer of 1609, everyone had one. For a number of years author Rolf Willach has quietly tested early spectacle lenses in museums and private collections, and now he reports on this study, which gives an entirely new explanation of the invention of the telescope and solves the conundrum mentioned above. Willach is an optical engineer and independent scholar who worked for several years in the Department of Physics at the Institute of Astronomy in Bern. He has written extensively on the history of the development of optics and the telescope. Illus.
Realities of Images: Imperial Brazil and the Great Drought
From Elements to Atoms: A History of Chemical Composition (Transaction 92-4)
Alhacen on the Principles of Reflection: Volume 1: Introduction and Latin Text; Volume 2: English Translation (Transactions 96 No. 2 & 3)
Benjamin Franklin's First Govít. Printing: The PA General Loan Office Mortgage Register of 1729, & Subsequent Franklin Mortgage Registers & Bonds
Additions to the Pleistocene Mammal Faunas of South Carolina, North Carolina, & Georgia (Transaction 92-5)
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