Columbia Type C1 singlephase (1910s) Previous
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This model had a number of unique construction features, possibly as a way to avoid patents owned by the 'big 4' companies. The stator on this meter was arranged with 2 potential coils in parallel and set near opposite ends of the disk and the current coils set in corresponding positions underneath the disk. Instead of the usual closed winding on the voltage coil(s), the lag load adjustment involved varying the effective length of the current coil with a slider on a U-shaped extension of one current coil. The light load adjustment was an adjustable iron punching on top of each voltage coil (to distort the shape of the field through the coil). Replacing the jewel bearing on this meter was as simple as sliding a retaining spring out of the way. Columbia C1
Electrical Meterman's Handbook