A Bureau of Mines Direct-reading Azimuth Protractor.
NTIS: PB 228 688 :7 pages
This report describes the construction and use of a direct-reading azimuth protractor (drap) by the Bureau of Mines for measuring fracture orientations in mines, tunnels, or other excavations having a magnetic environment. The drap allows a rapid and simultaneous measurement of dip and azimuth of dip of a fracture plane. The instrument is rugged, lightweight, and easily constructible from standard hardware items. The drap can measure dip to within +- 0.5 Deg. and azimuth of dip to within +- 5 deg. of corresponding values obtained with a brunton compass.
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