An introduction to physiology . muscle, fasten it in the muscleclamp, tie a fine copper wire around the tendoAchillis, wrap the wire about the hook on themuscle lever, and fasten the end in the bindingpost of the muscle lever (Fig. 21). Connectthe secondary coil with the posts on the muscleclamp and muscle lever respectively. Weightthe muscle with ten grams. Arrange the leverto write on the drum. Eecord single contrac-tions with various speeds. Note that the muscle writes its contractionin the form of a curve, the ordinates of whichmeasure the height to which the load is lifted. 86 GENERAL PRO
An introduction to physiology . muscle, fasten it in the muscleclamp, tie a fine copper wire around the tendoAchillis, wrap the wire about the hook on themuscle lever, and fasten the end in the bindingpost of the muscle lever (Fig. 21). Connectthe secondary coil with the posts on the muscleclamp and muscle lever respectively. Weightthe muscle with ten grams. Arrange the leverto write on the drum. Eecord single contrac-tions with various speeds. Note that the muscle writes its contractionin the form of a curve, the ordinates of whichmeasure the height to which the load is lifted. 86 GENERAL PROPERTIES OF LIVING TISSUES Light Muscle — A stout yoke (Fig. 21)bears two set screws holding a steel axle upon whichis mounted a light piece of tubing and a hard-rubberpulley. One end of the tubing tapers slightly toreceive the writing straw. The other projects behindthe axle, and may be pressed upon by the accuratelycut after-loading screw. The pulley is pierced with ahole for securing a fine wire by means of which a. Fig. 21. The light muscle lever, with double hook straw fastener ; theactual size. weight may be suspended from the pulley whenit is desirable that the weight should be appliednear the axis of rotation. The muscle may also beweighted directly by means of a scale-pan suspendedfrom the double hook to which the lower end of themuscle is attached. If the tendon of the muscle befastened to the double hook by a fine wire, the freeend of the wire may be carried to the insulated bind- 1 First Catalogue of Harvard Physiological Apparatus, Sep-tember, 1901. THE GRAPHIC METHOD 87 ing post provided for convenient electrical stimula-tion. The upper end of the muscle may be graspedin the flat-jawed clamp (Fig. 16), and thus connectedelectrically with the binding post upon it. In obtainiug the extension curve of muscle thislever, after-loaded, may be weighted to one hundredgrams without bending and thus deforming the abscissa will be a straight line. The movi
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