Gutmann Type B (1901 to 1903) Previous
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The Type B was functionally identical but a much more compact version of the Type A. A single spirally-slotted disk was used instead of the large cylinder/disk assembly used in the Type A. The voltage and current coils were positioned side by side on a radial axis between the shaft and the edge of the disk to get the space and time displacement needed to make the disk turn. The cover on this meter was either cast aluminum or glass with an extension on front to make room for the disk and was sealed at the factory with no provision to remove it in the field (the warranty was voided when the cover was removed!). This meter was discontinued in 1903 due to a patent lawsuit brought by Westinghouse. Gutmann Type B
Photo by Bud Russell