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Amplidyne
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An amplidyne is an obsolete electromechanical amplifier invented prior to World War II by Ernst Alexanderson. It consists of an electric motor driving a DC generator. The signal to be amplified is app
Three amplidynes, from a 1951 General Electric advertisement (not to same scale). (top left) 1 kW amplidyne motor–generator, (bottom left) 3 kW amplid
Three amplidynes, from a 1951 General Electric advertisement (not to same scale). (top left) 1 kW amplidyne motor–generator, (bottom left) 3 kW amplidyne motor–generator, (right) 5 kW amplidyne generator.
Metadyne
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A metadyne is a direct current electrical machine with two pairs of brushes. It can be used as an amplifier or rotary transformer. It is similar to a third brush dynamo but has additional regulator or
Spare Metadyne carbon brushes. They are individually wrapped and, together with labels, sealed in plastic. Total length including the connecting wire
Spare Metadyne carbon brushes. They are individually wrapped and, together with labels, sealed in plastic. Total length including the connecting wire and ring is 115 mm. The thickness of the carbon slab is 8 mm.
Three arrangements of a metadyne cross-field DC machine, and the construction of Macfarlane's Magnicon
Three arrangements of a metadyne cross-field DC machine, and the construction of Macfarlane's Magnicon
A London Underground CP train (in red) at Upminster. They were originally fitted with Metadyne controls and were the first electric multiple units to
A London Underground CP train (in red) at Upminster. They were originally fitted with Metadyne controls and were the first electric multiple units to use regenerative braking.