9. All center lines to be alternate dot and dash in fine black line. All dimension lines to be double dot and dash, with a central space for the figure, and of such strength as to show on blue-print more faintly than lines of drawing. Lines of drawing to be bold and clearly defined in proportion to the scale, and may be shade-lined by making the right-hand and bottom lines heavier. No ornamental shading or other “frills” allowed on shop drawings.
10. Every drawing, whether whole or half-sheet, shall have the title, date, scale and number of the sheet stamped in lower right-hand corner, and the quarter and eighth sheets printed on top.
11. The name of the drawing, as given in the title, is invariably to consist of two divisions in one line separated by a hyphen. The first division is to state the general name of the thing or machine, and the second name is to clearly designate the part or parts represented (or if a general view should so state). The wording of titles should be submitted to the chief engineer or head draughtsman for approval.
12. Each drawing shall bear the name of the draughtsman and examiner, the surname being used without initials.
13. Drawings of piping details shall be made in diagram form, using standard symbols.
14. All detail parts for standard or repetition work shall be shown unassembled as far as possible.
DRAWING SYMBOLS.
15. Detail shop drawings should state:
(a) The pattern number of every casting in plain figures of larger size than the dimension figures.
(b) The material of which the parts are made, using symbols as follows: C.I.—Cast iron. W.I.—Wrought iron. M.S.—Machinery steel. H.S.—Hammered steel. Bs.—Brass. Bbt.—Babbitt. Bz.—Bronze. C.R.S.—Cold rolled steel.