Chicago : Engineering and Contracting Pub. Co. · leaf 360
ods are lowered, giving thegelatine time to cool and set and the acid timeto etch a good line. It is found that aciddiluted with 12 parts of water gives bestresults. It is diluted in the office and carriedto the drill in hard rubber bottles with screwtops, which are much more convenient thanthe… … Fig. 3—Compass for Determination ofCourse of Drill Hole in Non-MagneticFormation. pass dried to prevent rusting. This tube formsa permanent record of the inclination andcourse of the hole at the depth where the testwas taken. The thermos bottle is 1% ins. outsidediameter and consists of two clear…
Buildings
Internet Archive · University of Illinois Urbana-Champaign · Public Domain Mark 1.0. Free to use for anything.
