24. Changes in drawings, sketches or order lists issued to the shop
shall only be made when authorized by the chief engineer, or, in his
absence, by the chief draughtsman, and when so authorized shall be made
by the order clerk.
25. The names of all similar parts in order lists and drawings are to be
uniform.
26. Tracings must be kept in safe, for blue-printing purposes only.
Office copies of blue-prints must be used for references.
27. No drawing, print or photograph shall be taken from office without
permission.