Career
Five navy ships have been named after him and busts of him are to be found on the phare de Dunkerque and the phare de Goulphar (Belle-Île-en-Mer).
(This book was originally published prior to 1923, and rep...)
This book was originally published prior to 1923, and represents a reproduction of an important historical work, maintaining the same format as the original work. While some publishers have opted to apply OCR (optical character recognition) technology to the process, we believe this leads to sub-optimal results (frequent typographical errors, strange characters and confusing formatting) and does not adequately preserve the historical character of the original artifact. We believe this work is culturally important in its original archival form. While we strive to adequately clean and digitally enhance the original work, there are occasionally instances where imperfections such as blurred or missing pages, poor pictures or errant marks may have been introduced due to either the quality of the original work or the scanning process itself. Despite these occasional imperfections, we have brought it back into print as part of our ongoing global book preservation commitment, providing customers with access to the best possible historical reprints. We appreciate your understanding of these occasional imperfections, and sincerely hope you enjoy seeing the book in a format as close as possible to that intended by the original publisher.
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( This work has been selected by scholars as being cultur...)
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(This historic book may have numerous typos and missing te...)
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1823 Excerpt: ...station on the draught may be roughly estimated, it is only necessary to describe small arcs vx, yx, of the circles passing through the points A,E, F, and the point of station. The position К may be verified by means of the angle taken from E to D, in the following manner: from the centre a, describe the arc E d, on which measure the arc E e, equal to double the value of the angle under which the side ED had been observed; draw a line through the points D and e, which, being continued, will pass the point of intersection of the circles described on the sides EF and EA; which proves that the point K was the true place of observation at 4 h. 50 m. The position of the point K might also be verified by constructing a circle about the side AF, considered as a chord double the value of the two observed angles AKE, EKF, or on one of the sides AD, DE, DF; but the first method is preferable. Calculation is used, under many circumstances, to find the radii and centres of the circles; but the centres a and b are more frequently found by means of the scale of equal parts, and a good sector, in the following manner: To find the centre a of the circle, of which the side EF is considered as a chord of 65 x 2 = 130, take the length of EF; that is to say, the line Eg, with a pair of common compasses; this measure is transferred to the scale of equal parts, on the sector, which is adjusted so as to give this line Eg (considered as radius,) =100; then, to ascertain the length of the line g a, which, in the example, represents the cotangent of 65, take in the tables the value of this cotangent, which is = 46, 63. If Eg was made = 200, 300, 400, or 500, equal parts, g a would be = 46,63 x 2, 3, 4, or 5. The centre b, of the second described circle, is found by making, as ...
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cartographer engineer explorer
Five navy ships have been named after him and busts of him are to be found on the phare de Dunkerque and the phare de Goulphar (Belle-Île-en-Mer).
(This book was originally published prior to 1923, and rep...)
( This work has been selected by scholars as being cultur...)
(This historic book may have numerous typos and missing te...)
French Academy of Sciences]
He was a member of the Académie des sciences and the Bureau des Longitudes and is held to be the father of modern French hydrography.
