Type I (1903 to 1913) Previous
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The Type I was the first "modern" meter as it had all the basic features and adjustments found in today's meters. This model proved to be as popular with the utilities as the Thomson Recording Wattmeter had been just a few years earlier. In fact, this model proved to be dependable enough that many Type I meters were used into the 1960s (and possibly beyond). This is also the last model without a separate chamber for wire connections, the wires entering through holes in the sides of the base (requiring removal of the main cover for access to the terminals). The Type I comes in three different sizes depending on the meter's capacity. The vast majority of this model have metal covers, but a few have been made with glass covers (which have the nameplate attached to the cover instead of sitting behind the glass!). Most of the metal covers are stamped, but some of the very earliest Type Is have cast covers.
 
Type I, medium-capacity
David Dahle collection
Type I
Electrical Meterman's Handbook
Type I, glass cover
David Turner collection