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The Green Book's motto, displayed on the front cover, urged black travelers to "Carry your Green Book with you – You may need it". [35] The 1949 edition included a quote from Mark Twain : "Travel is fatal to prejudice", inverting Twain's original meaning; as Cotten Seiler puts it, "here it was the visited, rather than the visitors, who would ...
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 ...
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.
Red (635 nm), blueish violet (445 nm), and green (520 nm) laser pointers. A laser pointer or laser pen is a (typically battery-powered) handheld device that uses a laser diode to emit a narrow low-power visible laser beam (i.e. coherent light) to highlight something of interest with a small bright colored spot.
In 1971 Maiman founded the Laser Video Corporation, and from 1976 to 1983 he worked as vice president for advanced technology at TRW Electronics (now Northrop Grumman). [3]: 232 He later served as consultant to Laser Centers of America, Inc. (now LCA-Vision Inc.) and director of Control Laser Corporation. Maiman continued his involvement in ...
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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 ...