DSP and DAP series polyphase (1954-1960) Previous
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The DSP and DAP series meters was a complete redesign of the older CS and CA series polyphase meters. The 9 polyphase styles introduced with the C line were narrowed down to 5 (the -4, -6, -9, and -10 were dropped). This series of meters has an unusual frame design consisting of 2 sections, the front section having one retarding magnet and supports the disk and register. The rear frame has the other retarding magnet and attaches to the base. The stators are supported by the rear frame and in turn support the front frame. The current coils were embedded in polyester and since they were much more exposed (particularly on the DSP - the DAP meters typically were inside or in enclosures) than in the singlephase versions, the insulation was more prone to cracking and melting, hastening the elimination of this model from the field. DSP-8 polyphase
Lineman's Handbook