Stanley Model D (1898 to 1903) Up
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This model was an unique attempt to eliminate the jewel bearings that require periodic maintenance. By arranging a pair of magnets just so, a magnetic field was set up that was strong enough to float the disk in the gap between the magnets. To center it horizontally, the disk was mounted on a hollow steel shaft (the upper end had the pinion that drove the register) which had a fine piano wire strung through it. The full-load adjustment of this model was very similar to that of the GE IS switchboard meter (adjustable pieces on the ends of the magnets). Since there was technically no bearing system, no light-load adjustment was provided, and as was common with other early singlephase meters of its time, no lag-load adjustment was provided. This model was made in only one capacity - 50 amperes - and instead of having the terminals in an enclosure, cables were run out of the meter's base to connect it to the circuit. This was one of a handful of models with the cover sealed at the factory as it was not intended to be adjusted in the field. Stanley D
Tommy Bolack Collection