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A trouble light using a compact fluorescent lamp. From top to bottom are a hook, a cage, the switch and a handle in one molding. A trouble light, also known as a rough service light, drop light, or inspection lamp, is a special lamp used to illuminate obscure places and able to handle moderate abuse.
The earliest microscopes were single lens magnifying glasses with limited magnification, which date at least as far back as the widespread use of lenses in eyeglasses in the 13th century. [ 8 ] Compound microscopes first appeared in Europe around 1620 [ 9 ] [ 10 ] including one demonstrated by Cornelis Drebbel in London (around 1621) and one ...
Schematic view of a rigid borescope Borescope in use, showing typical view through the device. A borescope (occasionally called a boroscope, though this spelling is nonstandard) is an optical instrument designed to assist visual inspection of narrow, difficult-to-reach cavities, consisting of a rigid or flexible tube with an eyepiece or display on one end, an objective lens or camera on the ...
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
A photographic loupe for examining film and prints. A loupe (/ ˈ l uː p / LOOP) is a simple, small magnification device used to see small details more closely. [1] They generally have higher magnification than a magnifying glass, and are designed to be held or worn close to the eye.
Many operating room lights used halogen lamps [1] [2] or xenon lamps, [3] some with backup lamps that operated in case of lamp failure [4] until the advent of Light-emitting diodes as light sources since 2007 [5] which remove the problem of heat radiation and reduce energy requirements. [6]
An illustration of some of the optical devices available for laboratory work in England in 1858. An optical instrument is a device that processes light waves (or photons), either to enhance an image for viewing or to analyze and determine their characteristic properties.
Kerosene lamp, using kerosene as a fuel; Electric lamp, or light bulb, a replaceable component that produces light from electricity; Light fixture, or light fitting or luminaire, is an electrical device containing an electric lamp that provides illumination; Signal lamp, or Aldis lamp or Morse lamp, a semaphore system for optical communication
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