Gutmann Type A (1899 to 1901) Up
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The Type A meter was based on a prototype developed by Ludwig Gutmann and refined into a usable form with the help of R.C. Lanphier, and was different from other meters of its time. A spirally-slotted cylinder was used to achieve the required space and time displacement needed to make the rotor move. The U-shaped voltage coil straddled the lower part of the cylinder and the current coil (which was wound on porcelain spools) was positioned on opposite sides of the upper part of the cylinder. A disk was riveted to the bottom of the cylinder and was used for braking as in other meters. The pivot was formed on the end of the rotor shaft and if it wore down, the whole rotor had to be replaced. Full-load adjustment was accomplished by moving the magnet, the light load adjustment was a laminated iron core that moved up and down within the cylinder, and there was no power factor adjustment on this meter. Gutmann Type A
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