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A Jordan sunshine recorder (left). The other instrument is a Marvin sunshine recorder. Older recorders required a human observer to interpret the results; recorded results might differ among observers. Modern sunshine recorders use electronics and computers for precise data that do not depend on a human interpreter.
The Quadro Tracker, also known as the Positive Molecular Locator, was a fake "detection device" sold by Quadro Corp. of Harleyville, South Carolina between 1993 and 1996. . Around 1,000 were sold to police departments and school districts around the United States on the basis that it could detect hidden drugs, explosives, weapons and lost golf bal
As of 2013 every student is required to go through a metal detector and the school had 94 security cameras. From 2008 to 2013, it was consistently on the Commonwealth of Pennsylvania's list of "persistently dangerous high schools". [6] It is located in a school building with a capacity of 1,762 students and 249,000 square feet (23,100 m 2) in ...
A system used to detect weapons in schools and stadiums is coming under scrutiny as the company is accused of using misleading claims to sell its service. FTC settles with weapon detector maker ...
There are at least two types of devices used to detect precipitation: A light emitting diode weather identifier (LEDWI) sensor measures the scintillation pattern of the precipitation falling through the sensor's infrared beam (approximately 50 millimeters in diameter) and determines from a pattern analysis of the particle size and fall velocity whether the precipitation is rain or snow.
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NCTA (National Cable & Telecommunications Association) History of Cable Television. Washington, DC 2001 Brief narrative history; Archived 2012-01-19 at the Wayback Machine United States: Cable Television The Museum of Broadcast Communications 2001 Extensive, well documented; Young, C. RFMD. CATV Hybrid Amplifier Modules: Past, Present, Future ...
Pennsylvania’s Punxsutawney Phil might be the most well-known weather-predicting groundhog, but a new list casts doubt on his accuracy. Phil did so poorly that even nonliving critters outshine ...