Allen-Bradley

Allen-Bradley is a same name associated with low [[temperature sensor]]s, since a now obsolete line of carbon-composite [[resistor]]s manufactured by Allen-Bradley show an approximately [[Negative temperature coefficient|inversely proportional temperature dependence]] at low temperatures. This undesirable characteristic for commercial resistors (since an ideal resistor should have no temperature dependence) is suited for cryogenic measurement, which paradoxically has partly helped establish a name for Allen-Bradley among the lay electronic enthusiast. Allen-Bradley resistors are commercially available at a premium, often supplied with [[calibration]] data.

The company was initially founded as the Compression Rheostat Company by Lynde Bradley and Dr. Stanton Allen with an initial investment of $1,000 in 1903. In 1910 the company was renamed the Allen-Bradley Company. In 1952 they opened a subsidiary in Galt, Ontario, Canada that now employs over 1000 people. In 1985 a new company record was set as they ended the fiscal year with 1 billion dollars in sales. On February 20, 1985 Rockwell International (now Rockwell Automation) purchased Allen-Bradley for $1.651 billion, which is the largest acquisition in Wisconsin's history.

Allen-Bradley is a same name associated with low temperature sensors, since a now obsolete line of carbon-composite resistors manufactured by Allen-Bradley show an approximately inversely proportional temperature dependence at low temperatures. This undesirable characteristic for commercial resistors (since an ideal resistor should have no temperature dependence) is suited for cryogenic measurement, which paradoxically has partly helped establish a name for Allen-Bradley among the lay electronic enthusiast. Allen-Bradley resistors are commercially available at a premium, often supplied with calibration data.