The Machine
NEMA uses 10 wheels, of which four are normal electrical rotors with 26 contacts at each end that are scramble wired in a way unique to each rotor type; one is an electrical reflector (like the Enigma's Umkehrwalze) with one set of 26 pairwise cross connected contacts; and the remaining five are "drive wheels", with mechanical cams that control the stepping of the rotors and the reflector. The wheels are assembled on an axle in pairs consisting of a drive wheel and an electrical rotor.
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The four rotor pairs and the reflector
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The rotor lodging with the cams and first rotor
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Top view of a NEMA rotor pair. Electrical rotor "F."
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Bottom view of a NEMA rotor pair. Drive rotor "18." Note the three stepping-control cams.
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An Enigma rotor.
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view of the right side of the machine with the port for the removable extra lamp pannel
The NEMA machine weighs about 10 kg and measures approximately 36×32×14 cm.
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—Henry David Thoreau (1817–1862)