Mémoire Descriptif De Plusieurs Machines. Construites À Rochefort, D'après Les Projets De M. Hubert. Par M. Ch. Dupin. Rapport Sur Ce Mémoire, Fait À La Classe Des Sciences Physiques Et Mathématiques De L'institut — Gaspard Clair F.M. Riche De Prony. This work records a class report on a mémoire describing several machines built at Rochefort, following Hubert’s naval-engineering projects. It presents seven machines and sketches their purposes and mechanisms, focusing on improvement in testing and manufacturing for naval use. The first device is a dynamometer to measure the strength of ship rigging, providing precision by recording tensions throughout a test, allowing determination of forces just before rupture. The text details counting devices to register revolutions of hydraulic axes, then drill and mortising machines for ship components such as blocks and pulleys. There is a wind-driven drag-mill (moulin à draguer) that cleans and maintains the harbor works by alternating engagement of gears controlled by a mobile wind-driven lantern. The report evaluates the advantages and possible improvements, highlighting Hubert and Dupin as technically accomplished former Polytechnic students. It closes with assessments of novelty and utility for naval service.
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