. Carnegie Institution of Washington publication. 154 VITALITY AND EFFICIENCY WITH RESTRICTED the edge of the metal strip and all were secured to the felt at the back. A regular 4-foot telephone cable, with wires designated, which ends in the usual switchboard plug fitting into the ordinary receptacle was employed for purposes of connection. This offers very quick con- nection and good contact. The gauze on the face of the pad was moistened in warm saturated sodium chloride solution. Pads R and L were placed in contact with the skin on the right and left sides of the subject; G was plac
. Carnegie Institution of Washington publication. 154 VITALITY AND EFFICIENCY WITH RESTRICTED the edge of the metal strip and all were secured to the felt at the back. A regular 4-foot telephone cable, with wires designated, which ends in the usual switchboard plug fitting into the ordinary receptacle was employed for purposes of connection. This offers very quick con- nection and good contact. The gauze on the face of the pad was moistened in warm saturated sodium chloride solution. Pads R and L were placed in contact with the skin on the right and left sides of the subject; G was placed between them and somewhat lower on the abdomen. Two bands of elastic tape about the subject's chest held the pads in position. This tape did not have to be uncomfortably tight. Although unnecessary in these experiments, the pads could be worn a long time without annoyance, and they made good contact with the body for an indefinite time. The many thicknesses of cotton gauze provided against any scratching of the skin. R and L con- nected with the two terminals of the gal- vanometer string. G was connected to earth as a "; This method was found to be more satisfactory than to earth the frame and coils of the string galvanometer. With these electrodes it was nearly always possible to get satis- factory pulse records while the subject was engaged in the vigorous activity called for by the test.^ These same elec- trodes were used in recording the pulse when the subject walked on the treadmill (seep. 129). Several sets of electrodes facilitated the The electrocardiographic apparatus had been arranged in general to facilitate the taking of such records. In the nature of the case, it is most convenient to have the subject near the apparatus, but the apparatus should not be such as to annoy or distract the man. The electric motor which operated the camera was placed in an adjoining room and could run indefinitely with no disturbance. The illumination
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