by thirty-eight inches. The sizes of all connecting-plates, stay-plates, lacing-bars, connecting-angles, pins, fillers, rivets, etc., should be given, also those of all main members; and the exact spacing from back to back of all angles, channels, and webs, forming the various members, should be clearly indicated. The packing at all panel points should be shown, and the exact spacings therefor should be given by figures.

There should be indicated also all leading dimensions, such as the exact cambered lengths from centre to centre of pinholes for all truss members; the vertical distance from centre of bottom-chord pins to base of rail; the vertical distance front centre of bottom-chord pins to bottom of floor-beams; the vertical distance from base of rail to top of masonry; the clearance required above base of rail; the spacing of anchorbolts; the lengths of all built members beyond centres of pinholes; the spacing of rivets in flanges of stringers, floor-beams, and chord members in a general way, such as "16 spaces of 3" each," or "3" spacing as nearly as may be"; the distance from back to back of opposite flange angles in all girders and struts; the widths of webs of all plate girders; the spacing of stiffening angles; etc., etc. All joints which are to be planed or faced should be so indicated.

Each sheet should have a general and descriptive title written in a neat but plain style of lettering. The title and the number of the drawing should be placed in the lower righthand corner.

A single line drawn one-half inch from each edge of the sheet should define its margin, and if a rather fine line be drawn for each boundary of the tracing, and the sheet be trimmed just up to these boundary-lines, the blue-printer will have a well-defined border to which to trim his prints.

All lettering should be plain, but executed in a neat and workmanlike manner. Nothing adds more to the appearance of a drawing than neat lettering. Special care should be taken to locate all dimension-lines so there can be no doubt as to the distances they are intended to fix. All notes should be written in positions where they will be easily noticed, and so that they will not interfere with the lines of the drawing.