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The primary marketing point of the Lewis lamp was that it used less than half the oil of the prior oil lamps they replaced. The lamp used a similar design to an Argand lamp , adding a parabolic reflector behind the lamp and a magnifying lens made from 4-inch-diameter (100 mm) green bottle glass in front of the lamp.
A disadvantage of the lamp was that the weight mechanism had to be manually raised several times in one evening. If this was not done the wick burned. [4] Moderator lamps replaced the more complex clockwork-driven Carcel lamps and were widely used by the end of the 19th century, for both residential lighting and for lighthouses.
Magnifying glass on an arm lamp. The magnification of a magnifying glass depends upon where it is placed between the user's eye and the object being viewed, and the total distance between them. The magnifying power is equivalent to angular magnification (this should not be confused with optical power, which is a different
High-intensity discharge lamps (HID lamps) are a type of electrical gas-discharge lamp which produces light by means of an electric arc between tungsten electrodes housed inside a translucent or transparent fused quartz or fused alumina arc tube. [1] This tube is filled with noble gas and often also contains suitable metal or metal salts.
Left to right: MR16 with GU10 base, MR16 with GU5.3 base, MR11 with GU4 or GZ4 base Line drawing of an LED MR16 lamp, with a heatsink rather than a reflector. A multifaceted reflector (often abbreviated MR) light bulb is a reflector housing format for halogen as well as some LED and fluorescent lamps.
A magnifier is a device used for magnification. Magnifier can also refer to: Magnifying glass, an optical device for magnification; Screen magnifier, software that magnifies part of a computer screen Magnifier (Windows), a screen magnifier for Microsoft Windows; Magnifier (iOS), a magnifying glass app for iOS; Magnifier, a magnifying glass app ...
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