The shops must be supplied with drawings of any piece of machinery to be made, as guides to the workmen. These drawings are usually blue or black prints made from the tracings, as mentioned in the preceding paragraph.

The information in the following items should be shown by a drawing:

(1) One or more views of the article, amplified by cross-section views where needed, to show fully its form.

(2) Dimensions sufficient to make the article to the exact size required, and sufficient to save the workman the necessity of adding several dimensions to find another dimension.

(3) Designation of the material or materials of which the piece is to be made.

(4) Designation of the number of pieces required.

(5) Indications of any special features of material, finish, or changes from usual conditions.

(6) The scale to which the drawing is made, or the designation of the scale of each of the parts if they are drawn to different scales on the same drawing.

(7) The title and number of the drawing, giving names and uses of the parts shown, date of authorization and name of authority approving the drawing, and, if the drawing supersedes another drawing, a statement to this effect, giving name, date and number of superseded drawing.