. Eight lectures on the signs of life from their electrical aspect. Electrophysiology. 166 THE SIGNS OF LIFE the primary circuit, and (2) opening the galvanometer circuit, in quick and regular succession. This is very simply effected in the first of these keys by making. B C A Objecb.' Fig. 68.—A B C Key. The primary circuit of the inductorium is completed through the pools / /. Connection between G G short-circuits the galvanometer. Of the three pools in the centre of the key, the middle is connected to A, via the keyboard and galvanometer, the pool under W to C, and the remaining pool to B.
. Eight lectures on the signs of life from their electrical aspect. Electrophysiology. 166 THE SIGNS OF LIFE the primary circuit, and (2) opening the galvanometer circuit, in quick and regular succession. This is very simply effected in the first of these keys by making. B C A Objecb.' Fig. 68.—A B C Key. The primary circuit of the inductorium is completed through the pools / /. Connection between G G short-circuits the galvanometer. Of the three pools in the centre of the key, the middle is connected to A, via the keyboard and galvanometer, the pool under W to C, and the remaining pool to B. The three arms of the rocker are of unequal length, that connecting G G being a little longer than the centre arm, and this again longer than the connection between / /. On rocking the arms to the left, and then letting go the weight, the following events take place in order :— {a) The circuit// is broken, and an induction current passes through B A. ((5) ,, ,, B A is broken. (c) ,, „ A C is made, {jl) ,, ,, G G is broken, and any potential difference between A and C acts upon the galvanometer. Thus the in iuction shock caused by breaking p p passes through A B, A is then connected to C, and not till then is the galvanometer short-circuit G G broken, and the current from A C allowed to pass. To take the current from B C, the connections A and B are transposed. the curved wire in the galvanometer short-circuit a little longer than that in the primary circuit, so that the break shock takes. 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 Waller, Augustus Désiré, 1856-1922. New York : E. P. Dutton
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