The book A Manual of Physiology : With Practical Exercises was written by author Stewart, G. N. (George Neil), B. 1860 Here you can read free online of A Manual of Physiology : With Practical Exercises book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is A Manual of Physiology : With Practical Exercises a good or bad book?
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This circuit is completed by the wires or brushes, which are in metallic contact with each other ; and the relative position of the fixed con- tact in the primary circuit and of the troughs or copper blocks can be altered so as to alter at will the interval between stimulation and closure of the galvanometer circuit. The proportion of the whole revolution during which this circuit is closed can be varied by changing the relative position of the two copper blocks. Suppo.se the tissue is stimulat...ed at one end while the leading-off electrodes are at the other. When the contact a, l>, is made at the same time as c, d, no deflection will be shown by the galvanometer if the rheotome is revolving ra[)idly (the demarcation current being accurately compensated), because the circuit will be opened before the negative change has time to travel to the leading-off electrodes. But as the distance between b and d is increased, a small deflection Fk 191.— Diagram ok Difierential Rheotome. ELECTROPHYSIOL OGY 611 will appear, which, with further increase of the distance, will become larger, reach a maximum, and then begin to fall off again.
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