M1 (1913 to 1915)	Back	Up	Next
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.	Electrical Meterman's Handbook