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Science project idea on the use of induction coil in wireless telegraphy and in the production of spark in gasoline engine.
Wireless Telegraphy and Gasoline Engine Science Project Idea
By means of a spark coil, a sufficiently high voltage is produced to cause the current to leap across an air space, forming a spark.It consists of a central iron core, surrounded by a coil of heavy wire called the primary, and by a second outside coil, the secondary (Diagram).The primary is connected with a few cells of a battery, and with an interrupter as in the case of the electric bell. It is by the use of the induction coil that the sparks are produced which explode the gasoline vapor in the cylinders of a gasoline engine, and which send out the electric waves of the wireless telegraph.An Induction coil is also an essential part of the transmitting apparatus of a long distance telephone. In the wireless telegraph, the electric waves act upon the antenna, which is made of a number of parallel wires suspended on insulating supports from a mast or tower, and connected by a single wire with a rod on one side of the spark gap.Electric waves pass out into surrounding space from the antenna and cause similar electric waves in the antenna of the receiving station, which by means of pieces of apparatus called crystal detectors or audion detectors, are made susceptible of being detected by a telephone receiver.
Structure of an Induction Coil Diagram P, P, primary wire connected with battery.S, S, ends of secondary coil between which sparks leap.F, iron block which is pulled back when iron core is magnetized, thus breaking the circuit.The iron core is then demagnetized and the spring h pulls back the iron block F closing the circuit again.Note that there are more turns of the secondary than of the primary.
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