1. A PULSING DEVICE COMPRISING A RELAY HAVING A STARTING WINDING OF LOW RESISTANCE AND A DELAY WINDING OF RELATIVELY HIGH RESISTANCE AND A PAIR OF NORMALLY CLOSED RELAY CONTACTS, A CONDENSER, AND TWO TERMINALS FOR CONNECTING THE DEVICE IN SERIES WITH THE LOAD TO BE PULSED, WHEREIN THE STARTING WINDING IS CONNECTED IN SERIES WITH THE RELAY CONTACTS TO FORM A STARTING CIRCUIT CONNECTED BETWEEN THE TWO TERMINALS, AND THE DELAY WINDING IS CONNECTED IN SERIES WITH THE CONDESOR TO FORM A DELAY CIRCUIT WHICH IS SHUNTED ACROSS AT LEAST THAT PART OF THE STARTING CIRCUIT WHICH INCLUDES THE RELAY CONTACTS, THE TWO WINDINGS BEING SO CONNECTED THAT A CURRENT DISCHARGE FROM SAID CONDENSER THROUGH THE DELAY WINDING, WHEN THE ARMATURE CONTACTS ARE CLOSED, CAUSES THE DELAY WINDING TO PRODUCE A FIELD IN OPPOSITION TO THE FIELD PRODUCED BY THE STARTING WINDING BY A CURRENT IN THE STARTING CIRCUIT WHICH FLOWS THROUGH THE RELAY CONTACTS IN THE SAME DIRECTION AS SAID DISCHARGE CURRENT.