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One form has two straight legs joined by a hinge; one leg has a sharp pivot point and the other has a holder for a technical pen or pencil. Another form, the beam compass, has the pivot point and pen holder joined by a trammel bar, useful when drawing very large radius arcs. Often a circle template is used instead of a compass when predefined ...
Computer-aided process planning (CAPP) is the use of computer technology to aid in the process planning of a part or product, in manufacturing.; CAPP is the link between CAD and CAM in that it provides for the planning of the process to be used in producing a designed part.
A microfiche holder with microfiches. A microfiche is a sheet of flat film, 105 × 148 mm in size, the same dimensions specified for the A6 paper size format by the ISO 216 international standard. It carries a matrix of microimages. All microfiches are read with their text parallel to the long side of the fiche.
A sheet magnifier consists of many very narrow concentric ring-shaped lenses, such that the combination acts as a single lens but is much thinner. This arrangement is known as a Fresnel lens . The magnifying glass is an icon of detective fiction , particularly that of Sherlock Holmes .
A holder in front of the lens can hold a colored plastic film (gel) to tint the light or wire screens or frosted plastic to diffuse it. The Fresnel lens is useful in the making of motion pictures not only because of its ability to focus the beam brighter than a typical lens, but also because the light is a relatively consistent intensity across ...
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The first multi-sheet topographic map series of an entire country, the Carte géométrique de la France, was completed in 1789. [9] The Great Trigonometric Survey of India, started by the East India Company in 1802, then taken over by the British Raj after 1857 was notable as a successful effort on a larger scale and for accurately determining ...
In typical use, the route card will not be followed exactly by the party leader but is used as a backup if conditions deteriorate. When following legs on a compass bearing, the estimated time is not usually used as a precise indicator of when the leg is over but as a kind of fail-safe to stop the group from overshooting the actual objective and getting lost.