File:Quart de cercle mobile.jpg
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| Description |
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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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| 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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