. Fig. 7. Apparatus for studying sum- mation of contractions. A, block of wood wound with aluminum wire; B, primary coil; C, C, posts i and 2; U, dry cell; E, bare end of insolated wire turned back on itself. Genesis of Tetanus. Apparatus.—The apparatus is to be arranged as in Experiment 3, except that the mercury key is to be omitted, and the current of the battery circuit is to be made and broken as follows. Fasten the block of wood on which the aluminum wire is wound, to the edge of the table by a cabinet maker's clamp. Connect the binding post on block with post I of coil; connect post 2 o
. Fig. 7. Apparatus for studying sum- mation of contractions. A, block of wood wound with aluminum wire; B, primary coil; C, C, posts i and 2; U, dry cell; E, bare end of insolated wire turned back on itself. Genesis of Tetanus. Apparatus.—The apparatus is to be arranged as in Experiment 3, except that the mercury key is to be omitted, and the current of the battery circuit is to be made and broken as follows. Fasten the block of wood on which the aluminum wire is wound, to the edge of the table by a cabinet maker's clamp. Connect the binding post on block with post I of coil; connect post 2 of coil with one pole of dry cell; and fasten an in- sulated wire to the other pole. Now bend the free end of this wire back on itself, so that the end shall be smooth and rounded. "See that the wire is bright. If this wire be touched to any part of the aluminum coil the primary circuit will be made, and if the wire is drawn across the coils, a series of making and breaking shocks will be given. a. Sitmiuatioii of Tzuo Contractions. If two stimuli reach a muscle at a sufficiently short inter- val the second contraction process may begin before the first one is completed. What will be the result? In this, as in the preceding experiments, each student is to do the work independently. Experiment.—Blacken drum and arrange for quick speed; make a muscle preparation and mount it in moist chamber, as in Experiment 3; place drum so that lever will record well. Open short circuit key ; with the drum 4
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