Search results
Results from the WOW.Com Content Network
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.
Carrie Furnace is a former blast furnace located along the Monongahela River in the Pittsburgh area industrial town of Swissvale, Pennsylvania, and it had formed a part of the Homestead Steel Works. The Carrie Furnaces were built in 1884 and they operated until 1982. During its peak, the site produced 1,000 to 1,250 tons of iron per day. [3]
His invention controlled both the temperature and humidity, which helped maintain consistent paper dimensions and ink alignment at the printing plant. Later, together with six other employees, Carrier formed The Carrier Air Conditioning Company of America, a business that in 2020 employed 53,000 people and was valued at $18.6 billion. [30] [31]
The waveform of 230 V and 50 Hz compared with 120 V and 60 Hz. The utility frequency, (power) line frequency (American English) or mains frequency (British English) is the nominal frequency of the oscillations of alternating current (AC) in a wide area synchronous grid transmitted from a power station to the end-user.
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 ...
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.
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.
1907: The scout movement created by Lord Baden-Powell (1857–1941), on finding that his 1899 military training manual Aids to Scouting was being used by teachers and youth organisations. [ 248 ] 1908: The reserve forest which would become the Kaziranga National Park founded by Lord Curzon of Kedleston to protect the dwindling species of ...