Panoramas, construction of. 71 Paper, kinds used for drawings. 23-24, 60, 61, 66, 69 Pastes, use of. 37 Patterns, areal, method of drawing. 61-62 areal, plate showing. 62 Pen drawings, materials and methods used in making. 67-68, 68-69 Pencils, colored, use of. 26 drawing, quality and grades of. 25, 66 Pens, kinds of, used for drawing. 25, 48, 67 Photoengraving, cost of. 75, 78, 80, 81 general features of. 72-73 Photoengravings, printing and insertion of. 11 Photogelatin processes, description of. 82-83 Photographs, adaptation of. 83 bleaching of. 69 care needed in taking and handling. 32, 33, 39-40 copyrighted, consent for use of. 33-34 duplicate prints of, requests for. 34 mounting and numbering of. 33, 36-37 poor, mating of drawings over. 68-69 preparation of, for half-tone engraving. 77-78 record of source of. 34 selection of. 32-33 retouching of. 68, 70-71 suitability of. 9 unpublished, issue and use of. 34 Photolithographs, changes in. 39 Photolithography, description of. 86-87 Planographic process, description of. 87 Plans of mines, drawing and lettering of. 29, 65-66 symbols used on, plate showing. 20 Plates, differences from figures. 10-11 divisions of, serial letters and numbers for. 12 grouping small illustrations on. 36-37 methods of inserting, plate showing. 12 Political divisions, lettering of. 53, 54 Post-route maps, scales and detail of. 15 Projection for maps, preparation and checking of. 18-19, 43-45 Proofs, changes in. 76 correction of. 38-39 duplicate, supplying of. 30 submittal of. 38 Public-land maps, meridians, parallels, and township lines used on, diagram showing. 16 Public works, lettering of. 53 Punctuation marks, forms of. 54 Purpose of illustrations in Survey reports. 8, 40 R. Railroad surveys, data for maps obtainable from. 15 Railroads, names of, on maps. 57 Reduction of maps, marking drawings for. 63-64 means of. 18 Reduction sheet for lettering, plate showing. 54 use of. 55 Relief, methods of expressing. 48-51 Reproduction of illustrations, processes for. 72-90 relation of, to the drawing supplied. 7, 40 Reticulation, sketching by. 47 Retouching of photographs, materials and method used in. 68, 70-71 Reuse of illustrations, procedure for. 37-38 Rocks, igneous, names of. 95-97 metamorphic, names of. 95 sedimentary, names of. 94-95 symbols used to distinguish. 32 _See also_ Specimens. Roman numerals, numbers expressed by. 93 Rubber, liquid, use of. 37 S.