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The flashlight body was painted Army olive drab and the lens, switch and battery caps were finished in black, but the TL-122 used the same #14 screw-base bulb as the BSA flashlight. The TL-122 in its various forms was manufactured by various U.S., Italian, and British contractors for the US, British, Italian (post-WWII), and French armies.
Battery leakage is the escape of chemicals, such as electrolytes, within an electric battery due to generation of pathways to the outside environment caused by factory or design defects, excessive gas generation, or physical damage to the battery.
The best designs use a supercapacitor instead of a rechargeable battery, since these have a longer working life than a battery. This, along with the long-life light-emitting diode which does not burn out like an incandescent bulb , give the flashlight a long lifetime, making it a useful emergency light.
Formerly, the light source typically was a miniature incandescent light bulb, but these have been displaced by light-emitting diodes (LEDs) since the early 2000s. A typical flashlight consists of the light source mounted in a reflector, a transparent cover (sometimes combined with a lens ) to protect the light source and reflector, a battery ...
Diagram of a high-pressure sodium lamp A high-pressure sodium lamp, Philips Master SDW-T 100W. Various types of chemistry are used in the arc tubes of HID lamps, depending on the desired characteristics of light intensity, correlated color temperature, color rendering index (CRI), energy efficiency, and lifespan.
What’s the best way to clean a phone screen, really?
Here's how to clean acrylic and oil-based paint with water, spirits, paint thinner or turpentine. Need to remove dried paint from paint brushes that are stiff? Here's how to clean acrylic and oil ...
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