The Life Of John Dollond F R S Inventor Of The Achromatic Telescope

Excerpt from The Life of John Dollond, F. R. S., Inventor of the Achromatic Telescope: With a Copious Appendix of All the Papers Referred To The subject of the following memoir is entitled to this introduction, and the public will receive with satisfaction the following account of the inventor of the achromatic telescope. John Dollond, fellow of the Royal Society, was born in Spitalfields, on the tenth day of June in the year 1706: his parents were French protestants, and at the time of the revocation of the edict of Nantz, which happened in the year 1685, resided in Normandy; but in what particular part of it is not at present precisely known: M. de Lalande does not believe the name to be of French origin: but however this may be, the family were compelled soon after this period to seek refuge in England, in order to avoid persecution and to preserve their religion. The fate of this family was not a solitary case; fifty thousand persons pursued the same measures, and we may date from this period the rise of several arts and manufactures, which have become highly beneficial to this country. An establishment was given to these refugees, by the wise policy of our government, in Spitalfields, and particular encouragement granted to the silk manufactory. 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.

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John Dollond FRS (10 June O.S. (21 June N.S.) 1706 ? 30 November 1761) was an English optician. He followed his father's trade, but found time to acquire a knowledge of Latin, Greek, mathematics, physics, anatomy and other subjects. Early in 1757 Dollond succeeded in producing achromatic refraction by the aid of glass and water lenses, and a few months later he made a successful attempt to get the same result by a combination of glasses of different qualities .