Inside views of the "Mischgerät" of the German "V 2 (=A4)", analog, computer (WW II)

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Photographs made by Adri de Keijzer

Inside view of one of the ring-modulator modules (stages) (the adjacent module below has been removed  (disconnected)). The two black devices on the right-hand side are EF 14 high slope amplifier valves (tubes). The rectifier-cells on the far left-hand side belong to the ringmodulator circuit.

View on the opposite side of the mounting frame (screening covers removed)

Remarks:
The principle of this analog computer had been brought, by Werner von Braun, to the US shortly after WW II.
Peenemünde used a similar kind of computer technology (technical calculations), be it with far more capabilities. There is evidence, that this kind of technology (principle)had been used for a decade since in the US.

Holzer, its inventor, became later an American citizen and became a director of an American mathematical institute.

The ringmodulator technology has advantages, as DC signals could now be controlled by AC means.

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