SPECIAL COMMUVKATIONS A Myograph for Measwement of the Isometric Tensions


L HE NEED for an accurate, sensitive, isometric myograph to record the tension de-veloped by extracted muscle fibers has led to the development of the instrument to be described here. For investigations in which the tensions developed may vary from 50 mg to 2 gm, this myograph may have widespread application. A bonded, strain gage myogcaph utilizing the same physical principle has been previously described by Davidson (I), The tension sensitive element of the myograph, a mechano-electronic transducer tube # 5734 (RCA), has been used in a variety of physiological recording applications (2-4). This transducer is basically a triode in which a shaft continuous with the plate extends through a thin metal diaphragm at one end of the tube. Angular displacement of the plate shaft changes the distance between the plate and the cathode, thus altering the resistance of the tube. The plate resistance change is in proportion to the degree of angular deflection of the shaft. I f such a deflection is brought about by attaching a muscle fiber to the plate shaft and inducing the fiber to contract, and if the tube is employed as the variable compo-nent of a suitable bridge circuit, then the amplified change in bridge current may be fed into a sensitive recording meter that graphically represents in a linear fashion the tensio

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