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The high power efficiency of the piezoelectric bimorphs made a battery-powered reading machine possible. The small size and weight of the bimorphs was also essential for portability. Later psychophysical experiments discovered that vibration around the resonance of conveniently sized bimorphs was optimum for the sense of touch.
Shaking the flashlight charges a capacitor or a rechargeable battery that supplies current to a light source. Such flashlights can be useful during an emergency, when utility power and batteries may not be available. Dynamo-powered flashlights were popular during the Second World War since replacement batteries were difficult to find.
This neck reading light is a great gift for those who have evening hobbies where they need a little bit of extra light, like knitting, cross-stitching, reading or even camping. Save $14 with Prime ...
A 230-volt LED filament lamp, with an E27 base. The filaments are visible as the eight yellow vertical lines. An assortment of LED lamps commercially available in 2010: floodlight fixtures (left), reading light (center), household lamps (center right and bottom), and low-power accent light (right) applications An 80W Chips on board (COB) LED module from an industrial light luminaire, thermally ...
The four-sided ceramic trees feature star cut-outs and are battery-operated to emit a cheery glow. "They go perfectly with my holiday colors of white, gold and silver," wrote one five-star reviewer.
The best reading glasses require great lenses, affordability, and durability. Here, experts explain what to find in a pair, and reviewers recommend their faves. These Stylish, Doctor-Approved ...
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