Prime mover dynamo plant having a speed droop characteristic

Claim 1

A POWER-GENERATING SYSTEM INCLUDING: A POWER GENERATOR; A VARIABLE SPEED MOTOR FOR DRIVING SAID GENERATOR; CONTROL MEANS FOR EXERTING A SPEED ADJUSTING EFFECT ON SAID MOTOR; MEASURING MEANS FOR MEASURING THE SPEED OF SAID MOTOR AND PRODUCING A FIRST EFFECT CORRESPONDING TO ACTUAL MOTOR SPEED; SET POINT MEANS FOR SETTING THE SPEED OF SAID MOTOR AND FOR PRODUCING A SECOND EFFECT IN ACCORDANCE WITH ITS SETTING; SAID MEASURING MEANS AND SAID SET POINT MEANS BEING AUTOMATICALLY OPERATIVE TO CAUSE SAID CONTROL MEANS TO EXERT SAID SPEED-ADJUSTING EFFECT ON SAID MOTOR IN SUCH FASHION AS TO OPPOSED CHANGE IN MOTOR SPEED, SAID SPEED-ADJUSTING EFFECT CORRESPONDING TO THE DIFFERENCE BETWEEN SAID FIRST AND SECOND EFFECT; SAID MEASURING MEANS BEING CONSTRUCTED AND ARRANGED TO PRODUCE SAID FIRST EFFECT IN THE FORM OF A PNEUMATIC SIGNAL CORRESPONDING TO THE SAID SPEED OF SAID MOTOR, AND SAID CONTROL MEANS BEING CONSTRUCTED AND ARRANGED TO RESPOND TO SAID PNEUMATIC SIGNAL AND TO SAID SECOND EFFECT IN ORDER TO PRODUCE SAID SPEED-ADJUSTING EFFECT; DROOP MEANS RESPONSIVE TO SAID SPEED-ADJUSTING EFFECT FOR MODIFYING SAID SECOND EFFECT SO AS TO OPPOSE THE TENDENCY OF SAID SPEED-ADJUSTING EFFECT TO OPPOSE SAID CHANGES IN MOTOR SPEED.