The recoil of the projectorcase resulted in small accelerations due to the large mass (about 25 kg). ... The interval generator gated a unijunction relaxation oscillator which determined the frequency of 1 15 Hz of the fundamental of the signal (see diagram in Fig. 3). ... The series of pulses was led through a low pass filter to reduce harmonics higher than 300 Hz; this attributes to an equal ... All the electrical circuitry for the sound emission was powered by a 44 Ah 12 volt motorcar battery.
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