This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1816 edition. Excerpt: ... the mode adopted by the ancients to obtain a standard measure from the earth, was of necessity, as the pendulum was not then known. As to its depending on two elements heterogeneous to each other, that is of no consequence, if each be uniform in itself, which uniformity cannot be doubted. But all ...
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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1816 edition. Excerpt: ... the mode adopted by the ancients to obtain a standard measure from the earth, was of necessity, as the pendulum was not then known. As to its depending on two elements heterogeneous to each other, that is of no consequence, if each be uniform in itself, which uniformity cannot be doubted. But all those learned authors make one acknowledgment, which indeed settles the question of superiority. They mention, as a recommendation of the metre, that should it ever be lost, it may be easily recovered by means of the pendulum. Thus they allow the latter to be in reality the true standard and ultimate criterion. It must, however, be owned, that the accurate measurement of the pendulum, is a problem of peculiar difficulty. The obstacles, both natural and mechanical, that occur, are such as to render it doubtful whether the exact length from the point of suspension to the centre of oscillation has been ever ascertained.* The length of the pendulum, however, has been determined with sufficient correctness to answer every useful purpose of a standard for linear measure: even were it taken at 39}ff inches it would be sufficiently accurate in any part of * For a full and accurate account of the principles and varieties of the pendulum, see Dr. Rkes's New Cyclopedia j under the head Pendulum, which article is ascribed to the Rev. Dr. Pearson. England or France for practical utility. Still, however, it is most desirable that every property of this noble instrument should be perfectly known. In comparing the results of the most esteemed measurers of the pendulum given in page 8, it will be seen that there are anomalies which cannot be reconciled. Thus the lengths given by Graham and Borda differ the wrong way for their latitudes; were those results...
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New. Trade paperback (US). Glued binding. 154 p. In Stock. 100% Money Back Guarantee. Brand New, Perfect Condition, allow 4-14 business days for standard shipping. To Alaska, Hawaii, U.S. protectorate, P.O. box, and APO/FPO addresses allow 4-28 business days for Standard shipping. No expedited shipping. All orders placed with expedited shipping will be cancelled. Over 3, 000, 000 happy customers.
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