Boy’s Radio Micrometer
It is a very sensitive device and can detect heat radiation of very weak intensity from example radiation coming from a distant candle can be detected. IL is a combination of a moving coil galvanometer and a thermocouple. It consists of a single loop of silver or copper wire A. The lower ends of the wire are soldered to a copper disc which is coated with lamp black. The disc is exposed to heat radiation and as a result thermo-electric current of produced in the couple made of hismuth and antimony, say, begins to flow in the wire A. Hence we get a current in the galvanometer. The deflection produced in the galvanometer can be measured by using lamp and scale arrangement.
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