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Volumes

1. Vol 1 Inside the Teletype Mechanism — Vol 1: How Iron Reads a Bit A Model 15 has no clock, no memory, and no electronics. It decodes a serial data stream with a magnet, five cams, five swords, and a gear ratio of eight to seven — and that last number is the cleverest thing in the machine.
2. Vol 2 Inside the Teletype Mechanism — Vol 2: From Code Bars to Ink Five steel bars lying in a pattern, a bail that falls, and a type bar that flies. Then the power train that drives all of it — and the Model 28's completely different answer to the same problem.