Abstract: A sensor for rocket engines having at least one combustion chamber including a pressure-sensitive sensing device responsive to pressure in the combustion chamber for providing an output signal to a control device in response to the pressure in the combustion dropping below and/or rising above at least one predetermined pressure. The pressure-sensitive sensing device includes a piston arranged for displacement between first and second positions. The piston is displaceable from at least the first position to the second position in response to a first predetermined pressure value in the combustion chamber. A restoring force is effective for displacing the piston from the second position toward the first position in accordance with a second predetermined pressure value in the combustion chamber. The piston is arranged for triggering a signal in at least one of the first and second positions thereof.

Abstract: An adjustable time fuse includes an electrolytic cell with the anode and cathode connectible in two circuits with opposite polarity and a battery connected in the circuits. One of the circuits causes an element of the electrolyte to be deposited on one of the electrodes to activate the cell and the other causes the same element to be removed from the electrode. When this element is completely removed, the internal resistance of the cell increases rapidly. This increase in resistance triggers a thyristor to allow a condenser to discharge through a primer to produce the desired action.