Comprising 112 copper constant an couples in series and arranged in the form of a rectangle, with sensitive area of 18 x 22 mm. With a metal cone to increase directional selectivity. The inner surface of the cone is polished. With a pair of 4 mm sockets, on stand.The e.m.f. of the pile is of the order of 4 mV per °C difference between the hot and cold junctions.
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