Scales, bar, forms of. 50-60 measuring for projection of maps. 44 standard, of maps. 18 Scope of this manual. 7 Screens, half-tone prints showing effects produced by. 56 Selection of illustrations, considerations governing. 8-9 Sections, columnar, original drawings for. 31 columnar, symbols used in, plate showing. 32 structure, combination of, with views of topography. 30-31 drawing of. 64-65 original drawings for. 29-31 symbols used in, plate showing. 32 vertical exaggeration of. 30 Shading, kinds used. 67 Signs, mathematical, forms and names of. 04 Sises of illustrations. 11-12, 40 Specimens, borrowed and fragile, care of. 35 drawings of, methods of making. 60-68 paleontologic, transmittal of. 35 photographs of, how printed. 68 how used. 34-85 Springs, symbols for. 22, 23 State maps, use of. 15 Stipple, production of. 50, 51 Stone, engraving on. 89-90 Streams, drawing of. 51-52 lettering names of. 52 Submittal of illustrations. 10 Symbols, drawing of. 20, 61 for ground-water features, uniformity needed in. 21-23 for maps and mine plans, plates showing. 20, 46 uniform use of. 20, 45-46 for oil and gas wells, features of. 21 for structure and columnar sections, plate showing. 32 lithologic, use of. 32 T. Three-color half-tones, process of making. 78-80 Titles of illustrations, arrangement and place of. 58 printing of. 19-20 wording and lettering of. 19 Tooling on half-tones, effects obtained by. 77, 78 Topographic atlas sheets, scales of. 14 Tracing, method of. 46-47 use of colors in. 46-47 Tracing linen, use of. 24-25 Transferring, celluloid, process of. 47 celluloid, requisitions for. 47 Type, lettering with. 54-55 styles and sizes of. 55 V. Value of illustrations in Survey reports. 8 Vara, length of. 92 Vignetting, effect obtained by. 78 W. Wall map of the United States, use of, for basemaps. 14 Water colors, use of. 26, 67, 71 Waterlining, use of. 52 Wax engraving, process and advantages of. 80-81 Wells, symbols for. 22, 23 Wood engraving, process of. 81-82 Z. Zinc etchings, changes in. 38-39 drawings for. 74 insertion of. 11 making and advantages of. 73-75 [Illustration: circle] * * * * * Transcriber's Note Paragraphs split by illustrations were rejoined. Where Greek characters occurred in the original, [Greek: ] was substituted for them. To see these characters, view the UTF-8 or HTML version. End of the Project Gutenberg EBook of The Preparation of Illustrations for Reports of the United States Geological Survey, by John L. Ridgway