11.11

(a)  The drawings shall not contain text matter, except a single word or words, when absolutely indispensable, such as “water“, “steam“, “open“, “closed“, “section on AB“, and, in the case of electric circuits and block schematic or flow sheet diagrams, a few short catch words indispensable for understanding.

(b)  Any words used shall be so placed that, if translated, they may be pasted over without interfering with any lines of the drawings.