Search results
Results from the WOW.Com Content Network
New York Central Railroad's Empire State Express takes on water from the track pan at Palatine, New York, in 1905. A water trough (British terminology), or track pan (American terminology), is a device to enable a steam locomotive to replenish its water supply while in motion. It consists of a long trough filled with water, lying between the rails.
An Aeroflot Airbus A330 being de-iced at Sheremetyevo International Airport Econ Salt Spreader. De-icing is the process of removing snow, ice or frost from a surface. Anti-icing is the application of chemicals that not only de-ice but also remain on a surface and continue to delay the reformation of ice for a certain period of time, or prevent adhesion of ice to make mechanical removal easier.
The screw pump is the oldest positive displacement pump. [1] The first records of a water screw, or screw pump, date back to Hellenistic Egypt before the 3rd century BC. [1] [3] The Egyptian screw, used to lift water from the Nile, was composed of tubes wound round a cylinder; as the entire unit rotates, water is lifted within the spiral tube to the higher elevation.
The Archimedes screw generator consists of a rotor in the shape of an Archimedean screw which rotates in a semicircular trough. Water flows into the screw and its weight presses down onto the blades of the turbine, which in turn forces the turbine to turn. Water flows freely off the end of the screw into the river.
Water freezes at 0 °C; however, a mixture of 70% de-icing fluid and 30% water freezes below −55°C. This is known as the eutectic concentration – the mixture proportion where the freezing point of the mixture is at its lowest point, and lower than either of the component substances.
Deicing boots were invented by the B.F. Goodrich Corporation in about 1929–1930 in Akron, Ohio.The work was begun by retired Ph.D chemist, William C. Geer.In its quest to develop deicing boots, the company built a large indoor facility in Akron to replicate bad weather and icing on aircraft wings.
The Levis De-Icer can use a maximum power of 250 MW; its operation voltage is ±17.4 kV. It can be used on multiple 735 kV AC power lines . When there is no icing, the Lévis De-Icer installed at Hydro-Québec 's Lévis substation 46°42′17″N 71°11′39″W / 46.70472°N 71.19417°W / 46.70472; -71.19417 , south of Quebec City ...
Calcium magnesium acetate (CMA, with chemical formula C 12 H 18 CaMg 2 O 12 [1]) is a deicer and can be used as an alternative to road salt.It is approximately as corrosive as normal tap water, and in varying concentrations can be effective in stopping road ice from forming down to around −27.5 °C (−17.5 °F) (its eutectic temperature [2]).