A text-book on chemistryFor the use of schools and colleges . 184 THERMO-ELECTRIC CURRENTS. Fig. 160. ^B. rent sets from the bismuth to the antimony, and whencold is applied, from the antimony to the important facts were discovered by Seebeck in1822, and the current designated thermo-electric cur-rents. If a rectangle, Fig. 160, be composed of a bar of an-timony, A A, and one ofbismuth, JB J3, on apply-ing heat to one of thejunctions a current willrun around the combina-tion, and a magnetic nee-dle suspended within bedeflected. For the production ofthese thermo-electric ef-fects
A text-book on chemistryFor the use of schools and colleges . 184 THERMO-ELECTRIC CURRENTS. Fig. 160. ^B. rent sets from the bismuth to the antimony, and whencold is applied, from the antimony to the important facts were discovered by Seebeck in1822, and the current designated thermo-electric cur-rents. If a rectangle, Fig. 160, be composed of a bar of an-timony, A A, and one ofbismuth, JB J3, on apply-ing heat to one of thejunctions a current willrun around the combina-tion, and a magnetic nee-dle suspended within bedeflected. For the production ofthese thermo-electric ef-fects two metals are notnecessarily required. One end of a thick metallic wirebeing made red-hot, and brought in contact with theother, a current instantly passes from the hot to thecold portion, and continues to flow in diminishing quan-tities until the two ends have reached the same temper-ature. Or if a metallic ring be made red-hot iii anylimited portion of its circumference, as long as the heatpasses with freedom to the right hand and the left elec-tric development does not appear, but if we touch wit
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