Willis Straight Line Meter (1890s / 1900s) Up
Up
Next
Next
 
I have almost no data on either the company or this meter, but it seems Federal Electric was a supply house and that Willis Meter Co. is the actual manufacturer. This meter seems to be a commutator-type (as most DC meters are), but instead of using a "swinging coil" light-load adjustment as most DC meters do, this one apparently used tapped resistors (note the green leads around the register sides). Interestingly, the full-load adjustment is also accomplished with this tapped resistor arrangement (instead of just manipulating the position of the brake magnets). Willis Straight-Line meter
Photo by Brian Olearchik