Some generators use both a synchroscope and a set of two lamps. One additional part is revealed to be necessary to assure the magnet's operation&colon; a synchroscope. The cross-coil synchroscope somewhat resembles a wound-field induction motor. The synchroscope is connected to the power grid and to the generator being started. To allow parallel alternators and power grid, a Synchroscope was added to the Switch Panel.