A new recorder utilizing Polaroid "picture-in-a-minute" film has been developed to monitor seismic data recorded on magnetic tape. Signals from 12 magnetic recording heads are applied through appropriate networks to conventional galvanometers in the monitor as the magnetic record is made. The optical system is arranged to make a miniature seismogram of conventional appearance on a standard 3 X 4 inch Polaroid print. The record is a satisfactory guide for the operator to evaluate the quality of the record on the magnetic tape without the need for playing it back.

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