'Master vibrator' definitions:

Definition of 'Master vibrator'

From: GCIDE

Master vibrator \Mas"ter vi"bra*tor\ In an internal-combustion engine with two or more cylinders, an induction coil and vibrator placed in the circuit between the battery or magneto and the coils for the different cylinders, which are used without vibrators of their own. [Webster 1913 Suppl.]