TY - JOUR
AB - ONE of the more useful by-products of the rapid development of radio technique is the use of thermionic valves as relays of negligible input power, freedom from contact troubles and practically instantaneous operation. These features are utilized to the full in the series of devices and instruments now marketed by Messrs. St'r Electronic Controls, 76 Cavendish Road, London, S. W. 12, as the result of considerable experience. One of the devices comprises an electronic relay operating on the usual alternating current supply of 230 volts 50 cycles per second, and giving an output of either 200 or 1,000 watts, the latter being capable of starting a 1/2 h.p. motor on 230 volts A.C. supply. This operation is obtained with no time delay and with an effective current through the regulating contacts of about two microamperes. The same instrument may also be usedfor high speed machine timing operations, or the regulation of temperature, pressure, humidity or hydraulic flow. As an example, a laboratory type of constant temperature bath is available, in which the accuracy of regulation is better than ± 0-01°C. Another type is a liquid level regulator, with no float or other moving parts within the container ; this is particularly suitable for use with electrolytes, and the electrodes may be a fraction of an inch apart or several feet from each other. An electronic 'stopwatch' records time intervals up to 2,000 seconds in intervals of a fifth of a second. It seems likely that these and other similar devices will find widespread application to laboratory and industrial processes.
TI - Electronic Relay Control
JF - Nature
DO - 10.1038/150345c0
DA - 1942-09-19
UR - https://www.deepdyve.com/lp/springer-journals/electronic-relay-control-dEN167FlO1
SP - 345
EP - 345
VL - 150
IS - 3803
DP - DeepDyve
ER -