Model A (1902 to 1908) Previous
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This was the first model made by Duncan Electric Mfg. Co. and was similar in design to the Thomson Recording Wattmeter. The bearing was different from the other meters as the pivot was retained in the disk shaft by magnetism. Also, the jewel could be lowered for shipping to prevent damage to the jewel and the jewel post had a window that allowed inspection without having to take out the post. This model also incorporated a cover sealing arrangement similar to the one incorporated in the Fort Wayne K series of meters. This was also one of only two early Duncan models that incorporated a 5-dial kilowatthour register (5-dial registers at the time typically registered in watthours). Model A
Electrical Meterman's Handbook