Foul detecting and signalling mechanism

Claim 1

A FOUL DETECTING AND SIGNALLING DEVICE FOR USE WITH A BOWLING ALLEY COMPRISING A VISIBLE SIGNAL, AN AUDIBLE SIGNAL, A SOURCE OF LIGHT AT ONE END OF THE FOUL LINE OF SAID ALLEY FOR PROJECTING A BEAM OF LIGHT ACROSS SAID FOUL LINE, A PHOTOCELL MOUNTED AT THE OTHER END OF SAID FOUL LINE AND POSITIONED TO RECEIVE SAID BEAM OF LIGHT, AND CONTROL MECHANISM FOR OPERATING SAID SIGNALS, SAID CONTROL MECHANISM INCLUDING A SOURCE OF D.C. POTENTIAL, A CAPACITOR, AND A RELAY ADAPTED TO ACTUATE SAID SIGNALS WHEN DEENERGIZED; SAID RELAY, CAPACITOR, AND SOURCE OF D.C. POTENTIAL BEING SO CONNECTED THAT SAID SOURCE IS ADAPTED TO CAUSE SAID CAPACITOR TO CHARGE AND SAID RELAY IS ADAPTED TO BE ENERGIZED BY SAID CHARGING CURRENT OF SAID CAPACITOR; SAID PHOTOCELL HAVING A LOW RESISTANCE AND BEING ADAPTED TO PASS A RELATIVELY HIGH CURRENT WHEN ILLUMINATED BY SAID BEAM OF LIGHT, AND HAVING A HIGH RESISTANCE AND BEING ADAPTED TO PASS A RELATIVELY LOW CURRENT WHEN NOT ILLUMINATED BY SAID BEAM OF LIGHT; SAID RELAY BEING SO CONNECTED TO SAID PHOTOCELL THAT IT WILL BE MAINTAINED IN AN ENERGIZED STATE BY SAID RELATIVELY HIGH CURRENT DRAWN BY SAID PHOTOCELL WHEN ILLUMINATED BY SAID BEAM OF LIGHT, BUT WILL NOT BE SO MAINTAINED BY SAID RELATIVELY LOW CURRENT DRAWN BY SAID PHOTOCELL WHEN NOT ILLUMINATED BY SAID BEAM OF LIGHT AND THAT WHEN DEENERGIZED IT WILL NOT