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In civil engineering, clearance refers to the difference between the loading gauge and the structure gauge in the case of railroad cars or trams, or the difference between the size of any vehicle and the width/height of doors, the width/height of an overpass or the diameter of a tunnel as well as the air draft under a bridge, the width of a lock or diameter of a tunnel in the case of watercraft.
Above a minimum threshold, discharging at a low rate delivers more of the battery's capacity than at a higher rate. Installing batteries with varying A·h ratings changes operating time, but not device operation unless load limits are exceeded. High-drain loads such as digital cameras can reduce total capacity of rechargeable or disposable ...
Deep-cycle batteries are also used as auxiliary batteries in recreational vehicles, but they require different, multi-stage charging. Discharging below 50% can shorten the battery's life. [36] Flooded batteries require inspection of electrolyte levels and occasional replacement of water, which gases away during the normal charging cycle.
These are also sometimes known as B batteries, but are very distinct from actual B cell batteries. 30-volt: Eveready 413: 20F20 (Zn/MnO 2) 210: 140: 30 V (20 cells) Flat round (one each end) H: 64 L: 25 W: 15 Used in older instruments. [248] These were sometimes sold as B batteries for hearing aids and small radios. 45-volt: Eveready 415: 30F20 ...
Stark images show the "heartbreaking" aftermath of the Los Angeles County wildfires, which continue to burn.
In 1969 Robert B. Cox, a farmer in Adams County, Iowa, invented an improved electric fence bracket and was issued United States Patent No. 3,516,643 on 23 June 1970. This bracket improved electric fences by keeping the wire high enough above the ground and far enough away from the fence to permit grass and weeds growing beneath the wire to be ...
The Palisades Fire burns a residence in the Pacific Palisades neighborhood of Los Angeles, on Jan. 7, 2025. Credit - Ethan Swope—AP More than 100,000 residents have been forced to evacuate Los ...
Russia now views arms control over the vast nuclear arsenals that were built up during the Cold War to be a thing of the past due to the lack of trust between Moscow and the West, Russia's top ...