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The multichannel time intervalometer (MTI) was designed and fabricated for use in detonation wave measurements. The electronic chronograph was designed to measure short elapsed time events, relative to a start pulse which results from detonation, occurring during relatively long observation periods. The MTI used a quartz crystal as a frequency source and employs high speed transistor components which are capable of providing accurate measurements of detonation velocities. Attaining this capability in a portable unit with its direct read-out feature enhances the experimenter's ability to study short duration events such as explosive behavior.