DS-2 through DS-5 (1906 to 1915) Previous
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With the introduction of the D-3 and D-4 polyphase meters, the DS-2 and DS-3 switchboard versions soon followed. In 1908, the DS-4 and DS-5 were introduced and these are identical to the DS-2 and DS-3 respectively except for the locations of the stators in the meter. The DS-2 and DS-4 both have cast metal covers (with windows for register and disk) and the DS-3 and DS-5 both have covers with glass windows on all sides.
 
DS-4
Electrical Meterman's Handbook
DS-5
Electrical Meterman's Handbook