. Calcutta Journal of Natural History. Electricity and Galvanism. 259 Now as the iodine is invariably liberated at the place where positive electricity enters the body containing it, we have a proof of the accuracy of the statement I made, that positive and negative elec- tricity were alternately evolved at both wires. On this account, however useful this apparatus is when we want the mere stimulant action, the simple shock of the electric agent, yet it is likely to fail in many cases of paralysis, in consequence of our not being able to transmit by its aid the positive current in the directio
. Calcutta Journal of Natural History. Electricity and Galvanism. 259 Now as the iodine is invariably liberated at the place where positive electricity enters the body containing it, we have a proof of the accuracy of the statement I made, that positive and negative elec- tricity were alternately evolved at both wires. On this account, however useful this apparatus is when we want the mere stimulant action, the simple shock of the electric agent, yet it is likely to fail in many cases of paralysis, in consequence of our not being able to transmit by its aid the positive current in the direction of the nervous ramifications. The more elegant and elaborate magneto-electric machine, especi- ally the very effective and powerful one of Mr. Clark's construction, may of course be substituted for the electro-magnetic apparatus I have described. The advantages it presents of being always ready for use, and requiring no initial voltaic current to set it in action, are not, however, I think by any means sufficient to compensate for its expense, and the readiness with which it is disarranged, especial- ly when in the hands of the A. The revolving cylinder, with slips of brass inlaid, on which the springs B. B. press. C. The battery, connected by wires with the screws D. E. F. F. ; the con- ductors, connected with the screws G. G., which are in communication with the fine coil in the box K. To render the electro-magnetic current available where it is required to be transmitted in a definite direction,—where, indeed, we want the currents separated as we get them in the voltaic or galvanic battery, without the serious inconvenience attending the use of these pieces of apparatus,—some modification of the electro-magnetic machine is. 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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