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• <br />C. F. & I. CANON CITY QUARRY REPORT <br />INSTRUMFNPATION <br />C~ <br />Five self-contained portable seicrrogz•aphs manui'ac~ured by V1~,-Nitro Consult <br />Inc. were used to monitor the blast. The seismograph (or velocity recorder) <br />is an electro-mechanical device containing a velocity transducer, timing <br />oscillator, galvonometers and optics to display the velocity waveform on a <br />permanent recording film, were used at selected test sites. <br />The transducer assembly converts the relative mechanical motion between the <br />magnet and coil assembly to an electrical output, this output being in <br />proportion to the seismic velocity. Three such elements are included in <br />the transducer assembly to provide an electrical output in three axes, each <br />at 90 degrees to each other, and further identified as the longitudinal, <br />transverse and vertical axes. <br />Contained In the recorder assembly are sensitive galvonometers and optics <br />necessary for registration of the waveform at the film plane in the film <br />magazine. <br />A time reference, as a separate channel, is placed on the upper edge of the <br />film record by a 100 cycle oscillator. This pulse may be used to obtain the <br />frequency of the seismic wave from the record. <br />Vt~'IGC0IARADO <br />