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Excerpt from The Beginnings of American Science: The Third Century; An Address Delivered at the Eighth Anniversary Meeting of the Biological Society of Washington He was an astronomer Of repute, and his Observatory built at Norriton in preparation for the transit Of Venus in 1769 seems to have been the first in America. His orrery, constructed upon an original plan, was one Of the wonders Of the land. His most important contribution to astronomy was the introduction Of the use Of spider lines in the focus of transit instruments.1' About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.