Type D-5 (1913 to the 1960s?) Previous
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This is the final version of Sangamo's mercury-motor watthour meter. There were no major changes from the earlier models, just numerous small changes that result from trial and error and constant fine-tuning. In addition to the standard 2-wire model, the 3-wire version of the D-5 was first made in a vertical tandem model, but was later made in a horizontal version which contained 2 2-wire D-5s with a common register and differential gearing. Most of the D-5 meters were made up to the 1930s, but continued to be available on a special-order basis into the 1960s.
 
D-5, 2-wire
Handbook for Electrical Metermen		 D-5, 3-wire vertical
Electrical Meterman's Handbook		 D-5, 3-wire horizontal
Handbook for Electrical Metermen