This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1892 Excerpt: ... element (which is shown in Fig. 118, and also in section in Fig. 119) consists of a carbon plate c, placed inside a porous pot p, and surrounded with a tightly packed mixture of carbon and peroxide of manganese, the top of the pot being run in with melted pitch. The Leclanche is a single-fluid cell, the porous pot ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1892 Excerpt: ... element (which is shown in Fig. 118, and also in section in Fig. 119) consists of a carbon plate c, placed inside a porous pot p, and surrounded with a tightly packed mixture of carbon and peroxide of manganese, the top of the pot being run in with melted pitch. The Leclanche is a single-fluid cell, the porous pot serving not to keep two fluids separate, but Porous Pot. merely to contain the broken carbon and manganese, and keep it in intimate contact with the carbon-plate. The exciting fluid is a solution of sal-ammoniac. Fig. 119. This solution has no chemical effect, either on the zinc (provided it is pure) or the peroxide of manganese, so long as the circuit is broken and the cell not at work. On the circuit being completed a current flows from the carbon to the zinc pole, the action in the cell being as follows: --The solution of chloride of ammonia (sal-ammoniac) is decomposed; the chlorine, attacking the zinc, forms chloride of zinc, which is soluble in the surrounding liquid; while the ammonia, developing at the surface of the carbon, forms a soluble compound with the oxygen which it extracts from the manganese. While the cell is at work, then the zinc is consumed and chloride of zinc accumulates in the solution, the carbon remaining unaltered, and the peroxide of manganese loses some of its oxygen. After a time, however, the supply of oxygen gete reduced and hydrogen accumulates on the surface of the carbon-plate, producing polarisation. If the circuit is broken, however, and K the cell left to rest' for a time, it will depolarise: the peroxide of manganese absorbing oxygen from the air. The terminal t is fixed to the carbon-plate by means of the lead cap n, which is cast on to the plate. Great care is necessary in fixing this lead cap to the carbo..
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All Editions of Telephones, Their Construction and Fitting: A Practical Treatise on the Fitting-Up and Maintenance of Telephones and the Auxiliary Apparatus