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The camera lucida is a lightweight, portable device that does not require special lighting conditions. No image is projected by the camera lucida. [citation needed] In the simplest form of camera lucida, the artist looks down at the drawing surface through a glass pane or half-silvered mirror tilted at 45 degrees.
As make-up became more mainstream and women were increasingly active outside the home, compacts became more popular. British manufacturer Stratton began importing part-finished powder boxes from the US for assembly at its Birmingham plant in 1923 and by the 1930s it was creating them from scratch and producing half the compacts used by the UK ...
A lens that is capable of magnifying the image on the film to at least the size of the original document. An easily replaceable light source that provides illumination without damaging the microfilm. Minimization of light effects of the room. A screen large enough to project the entire film image. An easily used loader for film rolls.
Loupe-mounted lights used to be fed by fiber optic cables that connected to either a wall-mounted or table-top light source. Newer models feature a more convenient LED lamp within the loupe-mounted light and an electric cord coming from either the conventional wall-mounted or table-top light source or a belt clip rechargeable battery pack.
The mirrors can be individually rotated ±10-12°, to an on or off state. In the on state, light from the projector bulb is reflected into the lens making the pixel appear bright on the screen. In the off state, the light is directed elsewhere (usually onto a heatsink), making the pixel appear dark.
A concave mirror, or converging mirror, has a reflecting surface that is recessed inward (away from the incident light). Concave mirrors reflect light inward to one focal point. They are used to focus light. Unlike convex mirrors, concave mirrors show different image types depending on the distance between the object and the mirror.
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