DS and DA (1954 to 1960) Previous
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In the 1950's, with metering technology improving, Westinghouse introduced a completely new design in their new DS and DA meters. Some of the major changes include: better overload compensation, larger register, Alnico retarding magnets cast into the frame (instead of the previous chrome steel magnet assembly), new stator design with adjustments in more accesible locations, and a compression-molded base. A new cover design was introduced with an alodized steel flange that was used in conjunction with a special sealing clip, but this did not last long as the industry preferred a more secure sealing solution. The current coils in the DS and DA were embedded in a polyester compound which unfortunately did not stand up well to the elements (the compound tended to crack as well as react with the copper in the coils). An all-metal cyclometer register (these have 4 vertical drums) was used on some of these meters but these developed problems with corrosion and fading and were replaced with a newer version that uses 5 horizontal plastic drums.
 
DS
Photo by Austin International
DA
Pete Mallet collection