Another possibility is a selenium rectifier, which could have been used in the time before semiconductors . talk ) 21 : 43, 10 May 2014 ( UTC)
12.
It used a selenium rectifier, came mounted on a wheeled chassis to make it easier to move around a garage, and could charge a starter battery in about an hour.
13.
Anything else, like selenium rectifier, for instance, does not come in small signal packages . "'Sp in ni ng Spark "'12 : 57, 3 January 2010 ( UTC)
14.
There were even a few " AA4 " designs, usually midget sets, only usable in strong-signal metropolitan areas, because most had no IF amplifier ( although some replaced the rectifier tube with a selenium rectifier ).
15.
In some countries the term " metal rectifier " is applied to all such devices; in others the term " metal rectifier " normally refers to copper-oxide types, and " selenium rectifier " to selenium-iron types.
16.
In 1941 Lashkaryouv published his fundamental discovery, the presence of a semiconductor layer between the barrier layer and the adjacent electrode, and the opposite sign of charge carriers ( electrons and holes ) on both sides of a barrier layer in solar cells of Cu 2 O and silver sulphide photocells and selenium rectifiers.
17.
The "'Fleming valve "', also called the "'Fleming oscillation valve "', was a vacuum tube ( or " thermionic valve " ) invented in 1904 by John Ambrose Fleming as a power supplies of a wide range of electronic devices, until beginning to be replaced by the selenium rectifier in the early 1930s and almost completely replaced by the semiconductor diode in the 1960s.
18.
On-site manufacturing capability covered every part of the engineering spectrum other than electron beam welding . There were acres of machine shops containing almost every variety of machine tool, extensive press shops, iron and non-ferrous foundries together with pattern shop and core shop, extensive drop-stamp forge, die-casting shops and tool room, tin-smiths'shop, copper oxide and selenium rectifier shops, electro-plating shop.
