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Lamsons bought a 51% stake in the Dart Cash Carrier Company in 1927 and became sole owner in 1948. Dart was based in Stoke on Trent, and Lamson relocated to new premises in Stoke in 1974. [5] Lamson Engineering Company Ltd survived until 1976 when it was taken over by Dialed Despatches to become D. D. Lamson.
DART quickly proved its value by improving upon existing plans of the U.S. military. What surprised many observers was DART's ability to adapt plans rapidly in a crisis environment. [3] DART's success led to the development of other military planning agents such as: RDA - Resource Description and Access system [3]
Like the manual block systems outlined above, automatic systems divide the route into fixed blocks. At the end of each block, a set of signals is installed, along with a track-side sensor. When a train passes the sensor, the signals are triggered to display the "block occupied" aspect on the signals at either end of that block.
Reference 2D21 tube is 2⅛ inches tall (54 mm). A thyratron is a type of gas-filled tube used as a high-power electrical switch and controlled rectifier. Thyratrons can handle much greater currents than similar hard-vacuum tubes. Electron multiplication occurs when the gas becomes ionized, producing a phenomenon known as a Townsend discharge.
For transmitting tubes in this system, the second element starts with a dash, a sequentially assigned number, then an optional letter specifying cooling method. For phototubes and photomultipliers, the second element is a sequential number and then a letter code identifying vacuum or gas fill and the type of cathode.
The DART ion source is a kind of gas-phase ionization, and it requires some sort of volatility of the analyte to support thermally assisted desorption of analyte ions. [14] This limits the size range of the molecules that can be analyzed by DART i.e. m/z 50 to 1200. [1] [15] DART-MS is capable of semi-quantitative and quantitative analysis. To ...
An 1898 account of a pneumatic tube system installed in Kirkcaldie & Stains department store in Wellington, New Zealand, states: In the basement is a half horse-power Crossley Bros. gas engine, which works a rotary blower, and this in turn supplies the compressed air required for the whole of the system.
Automatic block signaling (ABS), spelled automatic block signalling or called track circuit block (TCB [1]) in the UK, is a railroad communications system that consists of a series of signals that divide a railway line into a series of sections, called blocks. The system controls the movement of trains between the blocks using automatic signals.