. A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine . Fig. 172.—Tambours of Marey arranged for transmission of movement (after McKen-drick). a, receiving tambour; b, India-rubber tube; c, registering tambour; d,spiral of wire, owing to elasticity of which, when tension is removed from a, thelever ascends. The greatest danger in the use of such apparatus is not fric-tion but oscillation, so that it is possible that the original move-ment may not be expressed alone or simply exaggerated, butalso complicated by additions, for which the appar
. A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine . Fig. 172.—Tambours of Marey arranged for transmission of movement (after McKen-drick). a, receiving tambour; b, India-rubber tube; c, registering tambour; d,spiral of wire, owing to elasticity of which, when tension is removed from a, thelever ascends. The greatest danger in the use of such apparatus is not fric-tion but oscillation, so that it is possible that the original move-ment may not be expressed alone or simply exaggerated, butalso complicated by additions, for which the apparatus itself isresponsible. 184 COMPARATIVE Fih. 173. THE STUDY OF MUSCLE PHYSIOLOGY. 185 Fig. 173.—Diagrammatic representation of the pendulum myograph. The smoked-glass plate. A, swings with a pendulum, B. Before an experiment is commencedthe pendulum is raised up to the right and kept in position by the tooth, a. catch-ing on the spring-catch, b. On depressing the catch, b, the glass plate being setfree swings into the new position indicated by the dotted lines, and is held thereby the tooth, «, meeting the catch, b. In the course of its swing the tooth, a,coming into contact with the projecting steel rod, c, knocks it to one side, intothe position indicated by the dotted line, c. The rod, c, is in electric continuitywith the wire, x, of theprimary coil of an induction machine. In like mannerthe screw, d, is in electric continuity with the wire, y, of the same primary screw, d, and the rod, c. are provided with platinum points, and both are in-sulated by means of the ebonite block, e. The circuit of the primary c
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