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In the central position, the left-hand machine is disconnected, and the right-hand machine operates as a normal 13ZK. The switch in the centre of the front plate selects either (left) both rotors rotate in the same direction, or (right) they rotate in opposite directions. There is no back transfer facility on this machine. The lever on the left clears the input registers, and the result registers (accumulators) are cleared independently via the lever to the right of each register. The model number indicates (Z) that the revolutions counter has tens (zehn) carry and a combination (K) clearing option – in this case, the right hand lever clears only the revolutions counter, or the revolutions counter and the input registers, depending on the position of the switch on the right hand side of the front plate (position 1 for rev counter, position 2 for rev counter plus input registers).
#FRIDEN CALCULATOR VALUE MANUAL#
It is noted that the worked examples in the manual (in Chapter 2 specifically reference the Twin Marchant machine then in use in the British Army however, the examples can be modified to suit the Brunsviga. Since obtaining this machine, I managed to locate this Artillery Manual from 1944. Machines of this type were used for co-ordinate transformations, gunnery calculations, and complex number calculations. I also regard this as a machine that has narrowly avoided being lost to history. This is an interesting machine, not least because it was the first machine that I restored cosmetically beyond the usual cleaning and polishing. Capacity: 10x8x13 + 10x8x13 (But only the right-hand bank has a revolutions counter)