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In 1875, Roots exhibited a blower at the Saint Petersburg Exhibition; Thwaites and Carbutt exhibited a Roots principle "air blowing machine" for mine ventilation in the same exhibition. [ 6 ] In 1885, Edgar Dwight Johnston joined the firm of 30 people; he became vice president in 1889 and president in 1898, remaining so until at least 1931.
Roots blowers are also used in reverse to measure the flow of gases or liquids, for example, in gas meters. Roots blowers were used for cabin pressurisation in aircraft, initially being investigated immediately before WW2 (using the Marshall supercharger) and made by companies such as Sir George Godfrey and Partners who were still shipping ...
The Dresser brand operates in more than 60 countries with four principal business segments: Measurement and Distribution Systems, Flow Technologies, Infrastructure Solutions, and Power and Compression Systems. It retains trade names of Masoneilan, Consolidated, Becker, Mooney, ROOTS, and Wayne fuel pumps.
A gas meter is a specialized flow meter, used to measure the volume of fuel gases such as natural gas and liquefied petroleum gas. Gas meters are used at residential, commercial, and industrial buildings that consume fuel gas supplied by a gas utility. Gases are more difficult to measure than liquids, because measured volumes are highly ...
RootMetrics (formerly Root Wireless) offers scientifically collected and crowdsourced mobile network performance information to consumers and the industry. [1] The firm captures user information by testing network performance when consumers are using their mobile phone for voice or data communications.
The first variable area meter with rotating float was invented by Karl Kueppers (1874–1933) in Aachen in 1908. This is described in the German patent 215225. Felix Meyer founded the company "Deutsche Rotawerke GmbH" in Aachen recognizing the fundamental importance of this invention. They improved this invention with new shapes of the float ...
In September 2012, it was measured at 115.72 meters (379.7 feet) tall. [6] There are 7 other coastal redwoods known to be over 112 meters (367 feet) in height, and 222 specimens over 105 meters (344 feet). [7] There are only five species known to grow over 91 meters (299 feet) in height worldwide. [8]
Primary and secondary roots in a cotton plant. Root pressure is the transverse osmotic pressure within the cells of a root system that causes sap to rise through a plant stem to the leaves. [1] Root pressure occurs in the xylem of some vascular plants when the soil moisture level is high either at night or when transpiration is low during the ...