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 35
es are acceptable for plans of mines or underground workings, but all unnecessary or irrelevant details on such plans must be canceled and all essential fea- tures retained, and every essential feature, especially any added data, must be clearly interpretable. Many such blue prints are so large and… … -Conventional lines used in preparing plans and diagrams of mine workings to Figure 2. distinguish different levels. publication size. The shadowless drafting table, described on pages 47-48, is well adapted to the work of making such tracings. Blue prints can also be pantographed to any convenient…
Topographical drawing · Map drawing
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
