Original oil and gas vintage magazine ad for SEISMOGRAPH SERVICE CORPORATION in Tulsa, OK. LORAC purpose and principle is to provide an accurate and convenient means of establishing position not dependent on visibility, or on the use of short range, high frequency radio waves, and determination of the position at a point P with respect to three low frequency radio transmitters. This is accomplished by phase-meters which indicate indirectly the difference in distance between the point P and two fixed land-base transmitters such as T1 and T2 and T3. This 1953 unique old one page petroleum equipment trade advertisement would display beautifully matted and framed.
- SKU zd794
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