The preparation of illustrations for reports of the United States Geological survey : with brief descriptions of processes of reproduction (1920)
Ridgway, John L. (John Livesy), b. 1859, United States. Dept. of the Interior, Geological Survey (U.S.) · Washington, D.C. : Government Printing Office · leaf 37
folios. In preparing original drawings representing columnar sections, or sections in wells or ravines, the author should indicate all well-defined or important local features of structure, such as cross-bedding, ore bodies, or lenses. If there are no unusual features or details, the sub- divisions… … EXPLANATION LimeatDne Clay Bone Carbonaceous Shaly CoaL Cannel coal Bony coal shale Kmestone Vertical scale to Feet SO 10 '■■'•■'' T • FiGUEB 4. — Sections of coal beds. The figure shows the publication size and the arrange- ment of the sections. Each section should be drawn three-tenths or…
Topographical drawing · Map drawing
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
