This is the board layout for the telegraph.

The C code for the telegraph.

The schematic for the telegraph (see also the board layout). Attached is the GSchem original and derived formats.

This Perl script listens as a SMTP server, receives mail, and prints select headers to the telegraph.

This is attached to a resistance or capacitance to be measured, and converters it into a frequency. Intended for use with control board.

See also the layout.

Meet Suzy. Suzy is an authentic late-1800s telegraph, attached to a USB port with the aid of a microcontroller and the magic FT232 .