imate of what a model of his invention will cost.

[Sidenote: Working Drawings.]

Working drawings are different from those forming a part of the patent
in that they are more detailed, giving the size of each piece and the
material of which it is constructed. While working drawings are not
quite as expensive as models, they do not show the invention to the
advantage that models do, and are of little value to those who do not
understand them. On the other hand, working drawings have the advantage
of being easily sent through the mails, and can be duplicated at small
cost. Manufacturers prefer working drawings to models in quoting prices
on manufacturing the invention in quantities.

CHAPTER VI

HOW TO CONDUCT THE SALE OF PATENTS--_Continued_

In conducting the sale of patents, the greatest difficulty is most
frequently experienced in getting manufacturers or others sufficiently
interested to look into the merits and possibilities of the invention.
If the inventor can get the parties to actually consent in their own
minds to the proposition of taking up the invention, the question of
terms and conditions can soon be arranged. Until the parties solicited
can see beyond a doubt that there is large profits in it for them, the
price of the patent is out of the question; therefore, the first step is
to demonstrate its merits and commercial value, and get the parties
thoroughly interested.

Patentees should not labor under the impression that because a patent is
offered at a very low price that it will be quickly snapped up as a
bargain; as before stated, if a patent will not bring in money by
manufacturing and selling the article, it is worthless; and its real
value is in exact proportion to the amount of profits that can be made
from its manufacture.

Should the patentee find that his patent has no commercial value, it is
almost useless to spend more time and money in trying to realize
anything from it; he had better start again, and endeavor to invent
something that has value and can be sold.

[Sidenote: Value of Personal Influence.]

Inventors should use the full extent of their personal influence to
spread particulars of their inventions as far as possible, for this
indirect work is often a leading factor in creating a favorable
impression that frequently results in the adaption of an invention.

However unacquainted he may be in a business way, every patentee can,
more or less, in his immediate neighbo