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A limit switch with a roller-lever operator; this is installed on a gate on a canal lock, and indicates the position of a gate to a control system A limit switch mounted on a moving part of a bridge In electrical engineering , a limit switch is a switch operated by the motion of a machine part or the presence of an object.
To help producers understand how they could benefit from making the switch, the Australian Renewable Energy Agency (ARENA) provided funding to the Australian Alliance for Energy Productivity (A2EP) to undertake pre-feasibility studies at a range of sites around Australia, with the most promising locations advancing to full feasibility studies.
Edwin Fitch Northrup built the first prototype of a vacuum induction furnace in the United States of America in 1920. [citation needed] Medium frequency furnaces were seen soon afterwards in England and Sweden in 1927. [1] The process was initially developed to refine certain special metals such as cobalt and nickel. As these metals and alloys ...
carrier An aircraft carrier. carronade A short, smoothbore, cast-iron naval cannon, used from the 1770s to the 1850s as a powerful, short-range, anti-ship and anti-crew weapon. carry away To suddenly break a spar, rope or other part of a ship's equipment. May be caused, for example, by overloading, stress of weather, collision or battle damage.
Number portability is a service that allows a subscriber to select a new telephone carrier without requiring a new number to be issued. Typically, it is the responsibility of the former carrier to "map" the old number to the undisclosed number assigned by the new carrier. This is achieved by maintaining a database of numbers.
Hydrogen gas is widely discussed in the context of energy, as an energy carrier with potential to reduce greenhouse gas emissions. [ 167 ] [ 168 ] This requires hydrogen to be produced cleanly, in quantities to supply in sectors and applications where cheaper and more energy efficient mitigation alternatives are limited.
The Occupational Safety and Health Administration (OSHA) has set the phosphorus exposure limit (Permissible exposure limit) in the workplace at 0.1 mg/m 3 over an 8-hour workday. The National Institute for Occupational Safety and Health (NIOSH) has set a Recommended exposure limit (REL) of 0.1 mg/m 3 over an 8-hour workday.
1924: The Eddington limit – the natural limit to the luminosity of stars, or the radiation generated by accretion onto a compact object – discovered by Sir Arthur Stanley Eddington (1882–1944). [169] 1930s–1950s: Important contributions to the development of radio astronomy made by Bernard Lovell (1913–2012). [170]