Although the specific materials and methods used here would not have been available by 1900 this device is interesting as a way to visualize how the basic logic gates; AND, OR, XOR, XNOR, Set/Reset Latch and D Latch can be formed by connecting NOR gates. This breadboard also can be "routed" while it is powered up. Results are immediately visible without having to use an oscilloscope or voltage meter.
A word of caution this circuit is powered by 110VAC. Observe all pertinent safety precautions when building, testing and using the circuit.
Videos of the circuits can be seen here:
More background info available here: