Type A (1903 to 1904) Previous
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This meter was identical to the Round Type except for two major changes. One was to relocate the terminal chamber from the rear to a more accessible position on top. The other was to introduce a new bearing which consisted of a steel ball rotating between 2 jewels, and which would eventually displace the pivot-type bearing as the industry standard (superseded only by the magnetic bearing brought out by GE in 1948). Most Type A meters in existence have cast metal covers but some were produced with glass covers. A three-wire version of the Type A was also made, and this version is the only AC meter that is physically different from its two-wire version.
 
Type A, 2-wire
Westinghouse Handbook on Watthour Meters
Type A, 3-wire
Photo by Dale Sindelar