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English: The Green Book was a travel guide published between 1936 and 1966 that listed hotels, restaurants, bars, gas stations, etc. where Black travelers would be welcome. 21 volumes, 1937 - 1964. According to legal research done by NYPL staff, those 21 volumes have no known US copyright restrictions, and can be used and reused freely.
You needed the Green Book to tell you where you can go without having doors slammed in your face. [31] While the Green Book was intended to make life easier for those living under Jim Crow, its publisher looked forward to a time when such guidebooks would no longer be necessary. As Green wrote, "there will be a day sometime in the near future ...
The emitters are usually lasers, making what is termed a laser dazzler. Most of the contemporary systems can be carried by a person, and operate in either the red (a laser diode) or green (a diode-pumped solid-state laser, DPSS) areas of the electromagnetic spectrum. The green laser is chosen for its unique ability to react with the human eye. [5]
The first laser, invented by Theodore Maiman in May 1960. Nd:YAG laser: 1.064 μm, (1.32 μm) Flashlamp, laser diode: Material processing, rangefinding, laser target designation, surgery, tattoo removal, hair removal, research, pumping other lasers (combined with frequency doubling to produce a green 532 nm beam). One of the most common high ...
A suitable substance with a metastable state in the X-ray region is unknown in the open literature. [j] Instead, X-ray lasers rely on the speed of various reactions to create the population inversion. When heated beyond a certain energy level, electrons dissociate from their atoms entirely, producing a gas of nuclei and electrons known as a plasma.
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A metal doorframe with a strike plate built in: in other doors this would be a metal strikeplate in a wooden doorframe. The term door security or door security gate may refer to any of a range of measures used to strengthen doors against door breaching, ram-raiding and lock picking, and prevent crimes such as burglary and home invasions. Door ...
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