A mechanical recording accelerometer has been developed to measure firing or impact accelerations in nonrelated projectiles or rockets. The instrument is small, rugged, and self-contained, requiring no outside power, no external triggering, and no telemetry. The sensing and recording mechanism can be adapted to measure¬ment of impulses up to 5000 g over periods up to 30 msec. A record of acceleration magnitude versus time is provided with an accuracy of ± 10 percent- of peak values. The record is permanent and readily interpreted. Field tests of the instrument in an 81-mm mortar shell were successful. The instrument can be reused after recovery.
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