Abstract
SEVERAL PAVERS have been published describing methods of objectively recording twitch tension response to motor nerve stimulation. Some have incorporated expensive factory-built transducers. 1-4 One device, while simple and inexpensive, gives only visual results and is not suitable for recording purposes. 5 Recently a new transducer has been designed at UCLA. The device is simply constructed from inexpensive parts. It is adaptable for use with most DC amplifying and recording devices. The basic elements of this transducer are a U-shaped strip of spring steel, a strain gauge, and three resistors (Figure 1). We have cemented the strain gauge to the spring at the point of maximum curvature. Squeezing the spring produces distortion of the gauge and a change in its resistance to flow of current. The gauge forms one side of a wheatstone bridge, the other three sides consisting of the three resistors. These resistors are mounted in a plug that attaches the transducer to the strain gauge amplifier of the recording device. We have embedded the spring into
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