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For example, a PAR16 lamp is approximately 2 inches or 50.8 mm in diameter. [1] The size of rectangular PAR lamps is expressed as the letters REC followed by the reflector's mouth height, the letter "X", and the reflector's mouth width—with both dimensions in millimeters. For example, REC142X200 lamps are 142 high and 200 mm wide. [2] [3]
A balanced-arm lamp has a base, a stand or body, (in most cases) two connected arms (in many cases fitted with springs), and a lamp-head. The lamp can be moved into almost any position, and the balancing device will maintain the position until moved again. The same overall mechanism can be employed in other devices with similar requirements ...
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A 50-hour-life projection bulb, for instance, is designed to operate only 50 °C (122 °F) below that melting point. Such a lamp may achieve up to 22 lumens per watt, compared with 17.5 for a 750-hour general service lamp. [76] Lamps of the same power rating but designed for different voltages have different luminous efficacy.
Few changes greeted Sixty Special for 1947, as an all-new design was coming in 1948. Cadillac's famed "sombrero" wheel covers – in bright stainless steel - debuted this year. Behind the redesigned grille was the same 346 cu in (5.67 L) engine that Cadillac had been using since 1936, now rated at 150 horsepower (110 kW).
The Chrysler XIV-2220 (XI-2220 from 1944) was an experimental 2,500 hp, 2,220 cubic inch (36.4 liter) liquid-cooled inverted-V-16 World War II aircraft engine.Although several aircraft designs had considered using it, by the time it was ready for use in 1945 the war was already over.
Earliest published illustration of the species (a male), Mark Catesby, 1731 Swedish naturalist Carl Linnaeus coined the binomial name Columba macroura for both the mourning dove and the passenger pigeon in the 1758 edition of his work Systema Naturae (the starting point of biological nomenclature), wherein he appears to have considered the two identical.
1943 – (1-11) The aircraft carriers USS Princeton (CVL-23) and USS Belleau Wood (CVL-24) and Canton Island-based U. S. Navy PV-1 Venturas cover the unopposed American landing on Baker Island. On three occasions, F6F Hellcats from the carriers shoot down an approaching Japanese Kawanishi H8 K (Allied reporting name “Emily”) flying boat.
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