On the newer method for direct measurement of heart movement in animals.

Wire strain gauges were attached to the flexible part of one leg of the compass form apparatus. This apparatus was used to register the heart muscle movement electrically. It is light in weight, is suspended and attached to the heart surface by suturing or with an instant adhesive. The part on which thestrain gauge was attached, was so thin that the leg of the apparatus followed the heart muscle movements with high responsibility giving the load to the heart as little as possible. Thus this apparatus can be used in the investigation of the auricular or ventricular movements of not only large animals but also small animals, even the frog. The significance of using such an apparatus besides the arch form strain gauge was discussed.