The Elements of Electro-Chemistry Treated Experimentally. By Lüpke.
CHAPTER V
MAKING A MODEL
At the end of the chapter on drawing I explained how you could make models of mechanical movements of cardboard. And you will remember that the purpose of these simple models is to clear up points that are hazy when you are working out your invention on paper.
Kinds of Models.—Now besides cardboard models there are some other kinds, the chief ones being (1) rough models; (2) scale models and (3) working models, and each of these kinds is useful in its own way. The kind you should make, or have made, will depend on the bulge of your pocketbook as well as on the nature of your invention as you will presently see.
There was a time when the United States patent office required a model of every invention for which a patent application was made; as a result the noble patent office finally became a museum filled with antique models instead of an office in which business was transacted for and with inventors.
The government officials then concluded that the patent examiners didn’t really need to see the models anyway and then and there they ordered that a patent application only need be sent to the patent office—with one exception; this exception is made when a would-be inventor applies for a patent on a perpetual motion machine and then he is asked for a working model and if this is not forthcoming—and of course it never is—no further attention is paid to him or to his application.
Fig. 64. A ROUGH MODEL OF AN ELECTRIC MOTOR DRIVE FOR A LOCOMOTIVE