Fig. 105f. when you call the wireless pup or clap your hands he comes out of his dog house in a hurry
Saw the body of the pup and his legs out of separate pieces of wood and glue them together. He should be 2³⁄₄ inches high and 5 inches long when done and he must slide easily on the floor. See [F, Fig. 105].
The action of the wireless pup is like this: You push the pup into the house and back against the spanker as far as he will go; this presses the spring back and at the same time makes connection with the contact plate which closes the circuit.
The current from the battery then flows through the solenoid and transmitter and this magnetizes the iron plunger core and holds the spanker back against the force of the spring.
If now you call loudly, or clap your hands, the carbon granules in the transmitter will vibrate and this will suddenly weaken the current, and, hence, the magnetism of the solenoid. The instant the magnetic pull of the solenoid is weaker than the spring the latter will force the spanker against the posterior end of the pup’s anatomy and boost him out of his kennel.
CHAPTER XI
HOME MADE MUSICAL INSTRUMENTS
There is music in everything if you only know how to get it out without cracking it. When a small boy beats a pie-pan with a stick, or drums on a wooden fence he is making music, only the neighbors won’t believe it.
This is because he sets up the same note in succession and after a while the constant repetition of this single note gets on a grown-up’s nerves, especially if he is writing a book; hence he thinks the sounds are noise but it is really music of a bombastic[103] order.