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Printed glassine envelope for the photographer Arthur Weston, c. 1900 Glassine envelope. Glassine is a smooth and glossy paper which is air-, water-, and grease-resistant. It is usually available in densities between 50–90 g/m 2 (0.010–0.018 lb/sq ft). It is translucent unless dyes are added to the paper to color it or make it opaque.
An envelope is a common packaging item, usually made of thin, flat material. It is designed to contain a flat object, such as a letter or card. Traditional envelopes are made from sheets of paper cut to one of three shapes: a rhombus, a short-arm cross or a kite. These shapes allow the envelope structure to be made by folding the sheet sides ...
The 2 pence Mulready stationery issued in 1840. Rowland Hill expected the Mulready stationery to be more popular than the postage stamps but the postage stamp prevailed. The design was so elaborate and misunderstood that it generated widespread ridicule and lampooning, and in addition was perceived in some areas as a covert government attempt to control the supply of envelopes, and hence ...
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This makes the envelope more expensive. There is also the argument that the paper of the envelope can be substituted with lesser-quality paper as the envelope no longer must be written upon; [4] this perhaps was more relevant at the time of Callahan's invention but is a somewhat specious claim today. Over time the quality of paper generally has ...
Ponti was born in Milan in 1891 [10] to Enrico Ponti and Giovanna (Rigone). His studies were interrupted by his military service during World War I. He served as a Capitan in the Pontonier Corps (Corps of Engineers) from 1916 to 1918 and was awarded both the Bronze Medal of Military Valor and the Italian Military Cross.
The variable-frequency drive controls the speed of compressor motor. The compressor is specifically designed to run at different motor speeds to modulate cooling output. Variable speed operation requires an appropriate compressor for full speed operation and a special compressor lubrication system.