A modified Rossi circuit has been extended to a form in which it allows the recording of as many as six coincidence and four anticoincidence pulses with a resolving time of 3×10−9 second. All input pulses are negative and of any amplitude > 3 volts. A complete schematic is given of the circuit which has operated for six months without possibility of adjustment.

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R. L.
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L. A.
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