Maker's Name: 
S.I.E. (Southwestern Industrial Electronics)
Where made: 
11 × 13 × 14.5 cm

This unit contains a maximum of 12 pencil galvanometers in a block permanent magnet. They are driven by a bank of amplifiers to record seismic shot data from geophones. Two banks are usually required to give 24 channels of data from one seismic shot.The data is recorded on to a photo-sensitive paper strip, up to 4 or 5 seconds of data.

These units could be used in the field to collect data or at base to process corrected data.

Data would also be recorded on magnetic tape.