Submarine signal

Claim 1

IN A VEHICLE ADAPTED TO RISE THROUGH THE WATER AND CROSS AN AIR-WATER INTERFACE, SAID VEHICLE HAVING ELECTRORESPONSIVE MEANS THEREIN FOR INITIATING AN EVENT, AN IMPROVED ARMING AND FIRING SYSTEM FOR SAID VEHICLE COMPRISING SWITCH MEANS FOR CONNECTING A SOURCE OF ELECTRICAL ENERGY TO SAID ELECTRORESPONSIVE MEANS, SAID SWITCH MEANS COMPRISING AN ARMING SWITCH RESPONSIVE TO THE HYDROSTATIC PRESSURE OF THE FLUID SURROUNDING SAID VEHICLE AND ADAPTED TO BE OPEN WHEN SAID VEHICLE IS BELOW A PREDETERMINED DEPTH AND CLOSED AT SHALLOWER DEPTHS AND A FIRING SWITCH CONNECTED IN SERIES WITH SAID ARMING SWITCH AND RESPONSIVE TO THE DYNAMIC PRESSURE OF THE FLUID FLOWING PAST SAID VEHICLE TO BE OPEN WHEN SAID VEHICLE IS UNDER WAY AND TO CLOSE AS SAID VEHICLE CROSSES SAID INTERFACE, SAID FIRING SWITCH COMPRISING A HOUSING, HAVING A CHAMBER THEREIN, A SPRING-BIASED PISTON AND DIAPHRAGM ASSEMBLY EXTENDING ACROSS SAID CHAMBER, FLUID CONDUIT MEANS EXTENDING FROM THE SPACE IN SAID CHAMBER ON THE SIDE OF SAID PISTON AND DIAPHRAGM ASSEMBLY WHICH IS OPPOSITE SAID SPRING TO AN ORIFICE ON THE EXTERIOR OF SAID VEHICLE, SAID ORIFICE BEING DIRECTED INTO THE FLOW OF FLUID PASSING SAID VEHICLE, AND ELECTRIC SWITCH MEANS RESPONSIVE TO THE POSITION OF SAID PISTON AND DIAPHRAGM ASSEMBLY, WHEREBY, A COMPLETE CIRCUIT TO SAID ELECTRORESPONSIVE MEANS IS ESTABLISHED AT THE INSTANT THAT SAID VEHICLE CROSSES SAID INTERFACE.