Steampunk Electro-Optical Logic Machine

Could a digital computer have been built prior to 1900?  Babbage's Difference Engine shows one possibility of a mechanical computer but what about an electrical approach.  The Steampunk Electro-Optical Logic Machine uses photoconductors and gas discharge tubes which were both in use by 1880 to form a NOR gate logic array.  The principles of Boolean logic were also available by this time to assist in the systematic design of such a device.  The routing of light through total internal reflection had also been demonstrated.  

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:
http://twincitiespianolab.blogspot.com/2011/11/optically-routed-nor-gates-1.html