File:Quart de cercle mobile.jpg
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editDescriptionQuart de cercle mobile.jpg |
Français : Quart de cercle à une lunette ; voir détails |
Date | |
Source | Encyclopédie, planches de l'astronomie |
Author | Diderot et d'Alembert |
Détails :
- fig. 1 : AB, limbe gradué sur 110° (10° + 90° + 10°) ; A, micromètre ; G, levier de manoeuvre ;
- fig. 2 : lunette de visée ;
- fig. 3 : boîte à "cheveu", protection contre les courants d'air ; le plomb peut être freiné dans un liquide ; l'intérieur de la boîte permet parfois la mise en place d'une bougie pour éclairer le fil (travail de nuit) ;
- fig. 4 : fixation du fil à plomb (cheveu puis fil de soie et fil d'argent) ;
- fig. 5 et 6 : loupe ou microscope de lecture, adaptables en D.
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This work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 100 years or fewer. ![]() |
This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights. |
https://creativecommons.org/publicdomain/mark/1.0/PDMCreative Commons Public Domain Mark 1.0falsefalse
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current | 08:57, 22 October 2014 | ![]() | 2,355 × 3,543 (1.92 MB) | Aubry Gérard (talk | contribs) | User created page with UploadWizard |
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