M1 (1913 to 1915) Previous
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As with the previous M, the M1's body parts were made out of punched steel. The lag load adjustment was changed to a plate that surrounded the voltage coil tips and could be adjusted up and down as needed. The light load adjustment was replaced with a system that used a hollow square of copper that was operated by a lever to move it left or right. The full-load adjustment was the same as on the M, and remained unchanged until the MF series meters were introduced in 1934. Duncan M1
Electrical Meterman's Handbook