Just in case we haven’t already mentioned it…the official website for the Old Rhinebeck Aerodrome (where the Baker lives) is http://www.oldrhinebeck.org. Be sure to visit the site!
Sean Crimmins recently did an analysis of the wiring to generate a schematic. He also started to clean up the main switch. He said the following:
“The switch mechanism is pretty cool; it looks like an old phonograph tube. There are ten wires that go to the switch “roll” and connections are made by moving the speed handle. There are actually six forward speeds and three reverse speeds. With each movement of the forward position, the configuration of the switch assembly changes the path of the electricity through the resistor pack. The resistance to the motor gets lower as one would expect to go faster. I started to clean each switch connector with emery cloth and remove the dust/debris from the resistors.”
Here are a few photos of the switch assembly, schematic and resistor pack: