It was an ingenious design using only the promised household items. Four paperclips were used as contacts to read the codes (I told you there would be paperclips). They used an empty thread spool, wrapped it with uninsulated wire, then covered the wire with paper that had cutouts for the binary codes. Here is a diagram of the implementation of the Decimal to Binary Encoder from the book. So I was going to need some encoding wheels and some panel lights. It did this using some clever encoding wheels made from empty thread spools to enter the decimal numbers and light bulbs to display their binary equivalents. It's job was to accept decimal input from the operator and convert it into binary codes the computer could use. The first Working Digital Computer module described in the book was the Binary Encoder.
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