. Edinburgh New Philosophical Journal. Generation of Electrical Currents. 85 however, failed to prove what was sought. Since then I have found that, by regulating the section of the joint the galvanic current has to cross, it can be readily shewn that the current in the outer arms increases and diminishes, and this with arms of the same metal, where heat gives very little thermo-electrical action. Let a cross be made of two strips of rolled zinc, cut off the same sheet of metal, when the section of the central joint is quite small; a large portion of the current appears in the outer arms of th
. Edinburgh New Philosophical Journal. Generation of Electrical Currents. 85 however, failed to prove what was sought. Since then I have found that, by regulating the section of the joint the galvanic current has to cross, it can be readily shewn that the current in the outer arms increases and diminishes, and this with arms of the same metal, where heat gives very little thermo-electrical action. Let a cross be made of two strips of rolled zinc, cut off the same sheet of metal, when the section of the central joint is quite small; a large portion of the current appears in the outer arms of the cross; but as the section of the joint is enlarged, the quantity of electricity which appears in the outer arms decreases, until with a large section it disappears altogether. The annexed dia- A gram represents a cross, composed of three bars of bis- muth ; AC, a long bar; and DE and FB two half bars. The ends E and F of the half bars wereD C placed in metallic contact with the bar AC, but with a space interveningbetween them at G, whereby a galvanic current, passing along DB, had two joints to cross, one at E and another at F. When the space at G was H L closed, by pressing the points of the bars together into metal- lic contact, then a galvanic current passing along DB had only one joint to cross. The extremities of the bars at A and D were connected by wires with a Smee's battery of one or more number of plates ; and the other extremities at B and C had wires BI and CH soldered to them. The wires at H and I were connected with a Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original
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Keywords: ., bookcentury1800, bookcollectionbiod, bookdecade1850, bookyear1854
