now if you want to show a battery, a motor and a switch wired together all you have to do is to join the symbols with lines as shown at C in Fig. 31 and you will have what is called a diagram.
You can read a diagram, that is understand how it is connected up, in an instant for you can see at a glance how the wires run. Because the wiring is shown so simply and clearly diagrams of this kind are usually called wiring diagrams.
Fig. 31c. A SIMPLE WIRING DIAGRAM
In drawing wiring diagrams try to place each symbol in such a position that the connecting lines which represent the wires cross each other as seldom as possible, otherwise your diagram will be confused and it will be hard to follow out the circuits.
Some Aids to Drawing.—The following aid to drawing and designing was published in the English Mechanic and you will find it very helpful if your invention has to do with an automobile, aeroplane, or any large machine which is used or actuated by a person.
Fig. 32a. THE DIMENSIONS OF A MANIKIN