Abstract: A telemetric system has a conductive coil positioned adjacent to a muzzle. burst of transducer data is electromagnetically relayed to the conductive coil from a missile after it is fired. This conductive coil has longitudinally spaced windings distributed alongside the trajectory of the missile. The effective length of the conductive coil is at least in the order of magnitude of the distance traveled by the missile while the burst of transducer data is being transmitted. Data thus received can be utilized to drive recorders or similar equipment. The missile has on its outside an associated missile coil for transmitting the burst of transducer data. The coil is driven by a modulated carrier. This modulation is provided by a delay device that is driven by a transducer. This arrangement allows transmission of data corresponding to an operating parameter of the missile after a predetermined delay.

Abstract: A projectile strain damage indicator utilizes a plurality of strain gages xedly disposed on the orthogonal axes of a structural beam member which is operatively located within the ogive of a projectile. The strain gages provide electrical pulses to an energy conserving micropowered circuit which records strains only above a predetermined level that the projectile is subjected to while in transport.

Abstract: A single channel telemetry circuit is used to measure the in-bore environtal experiences encountered by a projectile and to delay transmission of the data gathered until the projectile is clear of the gun and at a time when a transmission link between an on board transmitter and a ground based telemetry receiving station has been optimized.

Abstract: A pulse detection system comprises, in series, a pulse amplitude detector, pulse width detector and a recorder. The pulse amplitude detector comprises a voltage comparator having an input for receiving a voltage pulse, a reference d.c. voltage input, a ground and an output for producing an output voltage when the input pulse equals a predetermined fraction of the reference voltage. The pulse width detector comprises a positively-triggered monostable having: a trigger input connected to the comparator output, a ground, a RESET, a RESET reference, a reference d.c. voltage input connected through a resistor to the RESET and through a capacitor to the RESET reference, and a Q output; and a positive-going clocked flip-flop having a clock input connected to the Q output of the monostable, a data input connected to the comparator output, a ground, a reference d.c. voltage input, a RESET, and a Q output connected through a delay resistor to the RESET and through a capacitor to ground.

Abstract: Three photometers are positioned at three points P.sub.1, P.sub.2 and P.s3, aligned with each other and with an illuminating flare, and located at equal distances d from each other, with the middle photometer at a distance D, greater than d, from the flare; the illuminations E.sub.1, E.sub.2, and E.sub.3 simultaneously received by the three photometers from the flare are recorded; and the transmissivity T, or transmission per mile, of the atmosphere traversed by the light is calculated from the formula: ##EQU1## where the E values are in foot candles and d is in miles.