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. 1832 Excerpt: ...the pallet arbor had a pin to work in the slit of one of the detent arms, it would be greatly improved. Although the drawing of this 'scapement, which was given in Nicholson's Journal, September 1806, is not exactly like the original, the principle of the 'scapement is, however, still the same. Peter Le Roy's ...
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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. 1832 Excerpt: ...the pallet arbor had a pin to work in the slit of one of the detent arms, it would be greatly improved. Although the drawing of this 'scapement, which was given in Nicholson's Journal, September 1806, is not exactly like the original, the principle of the 'scapement is, however, still the same. Peter Le Roy's 'scapement is the next step that was made towards this invention. He contrived it in 1748, and, like Thiout's, it has hardly ever been made use of. Both of them have a great recoil to give to the wheel before it could be disengaged, and their arcs of free vibration are not of much extent. Berthoud informs us, that in 1754, he made a model of one, which he gave in to the Royal Academy of Sciences. Camus, on its being shown to him at that time, told him, that the late Dutertre had made and used such a 'scapement, having a long detent, and free vibrations. Nothing appears now to be known of the construction of Dutertre's, and Lc Roy seems to have acknowledged the priority of it to the one he contrived in 1748. "My thought or invention," he says, " was not so new as I had imagined. Dutertre's sons, artists of come considerable repute, showed me very soon after, a model of a watch in this way by their late father, which the oldest Dutertre must still have. This model, very different from my construction, is, however, the same with respect to the end proposed." The detached 'scapement in Le Roy's time-keeper, which was tried at sea in 1768, is very different from that of his in 1748. Berthoud, in his TraiU des Horologes Marines, published in 1773, has given, in No. 281, an account of the principle on which the model was made in 1754; and, in No. 971, a particular description of the parts composing it, which are represented in plate XIX. f...
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