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Pole buildings do not require walls but may be open shelters, such as for farm animals or equipment or for use as picnic shelters. Enclosed pole buildings have exterior curtain walls formed by girts fastened to the exterior of the posts at intervals about 2 feet (0.61 m) on center that carry the siding and any interior load.
Pole house: a timber house in which a set of vertical poles carry the load of all of its suspended floors and roof, allowing all of its walls to be non-load-bearing. Prefabricated house : a house whose main structural sections were manufactured in a factory , and then transported to their final building site to be assembled upon a concrete ...
Like other gas-discharge lamps such as the very-similar mercury-vapor lamps, metal-halide lamps produce light by ionizing a mixture of gases in an electric arc.In a metal-halide lamp, the compact arc tube contains a mixture of argon or xenon, mercury, and a variety of metal halides, such as sodium iodide and scandium iodide. [7]
The next major drop in price came about in the 1880s with the introduction of electric lighting in the form of arc lights for large space and street lighting, followed by incandescent light bulb-based utilities for indoor and outdoor lighting. [3] [5] Over time, electric lighting became ubiquitous in developed countries. [6]
The first public demonstration of outdoor electrical lighting in the US was in Cleveland, Ohio, on April 29, 1879. [1] [8] Inventor Charles F. Brush had been perfecting the dynamo arc light, which could produce a glow equivalent to 4,000 candles in a single lamp. [8]
A garden solar lamp A child in Zambia studying by the light of a lamp charged by solar power during the day. A solar lamp, also known as a solar light or solar lantern, is a lighting system composed of an LED lamp, solar panels, battery, charge controller and there may also be an inverter.
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