On [page 235], [fig. 292] exhibits a reproduction of a patent office drawing, used in connection with specification papers in an application for a United States patent.
ENGLISH PRACTICE.
The rules for patent drawings in England are practically the same as in the United States; the paper sizes are, however, different. They must be on sheets of one of the two following sizes (the smaller being preferable), 13 inches at the sides by 8 inches at the top and bottom, or 13 inches at the sides by 16 inches at the top and bottom, including margin, which must be one-half an inch wide.
If there are more figures than can be shown on one of the smaller-sized sheets, two or more of these sheets should be used in preference to employing the large size. When an exceptionally large drawing is required, it should be “continued” on subsequent sheets. There is no limit to the number of sheets that may be sent in.
Fig. 293. See [page 244].
Useful Hints and “Points.”
Many of these “points” are repetitions, with but little variation from the way they have been previously stated; they are thus repeated to emphasize their practical worth.
A good draughtsman leaves his work in such a state that any competent person can without difficulty ink in what he has drawn.