Abney Level CST Berger, Abney Level CST 5-1/ 4& quot; long with radius arc graduated 0 to 90 degrees in both directions, with vernier reading to 10 minutes and percent of grade scale from 0% to 100% ....
Kompas Freiberg , Compas Geologi Freiberg, FREIBERG / FREIBERGER Geologist' s Compass : Geologist' s Compasseneral field-geological work Special structural-geological, deposit-tectonic, and....