. Carnegie Institution of Washington publication. PSYCHOLOGICAL PROGRAM AND TECHNIQUE. 181 before the contact is reestablished in switch ;S' (fig. 44). This precaution insures that when the switches are close together, that is, when a short-duration interval is used for the electric shock, the una- voidable chatter at reestablishment of contact in the switch ;S will not cause extra shocks to reach the tissue under examination. To avoid extraneous induction effects and disturbances from other electrical conductors and from the capacity of the earth, the electrical circuit shown in the diagram i
. Carnegie Institution of Washington publication. PSYCHOLOGICAL PROGRAM AND TECHNIQUE. 181 before the contact is reestablished in switch ;S' (fig. 44). This precaution insures that when the switches are close together, that is, when a short-duration interval is used for the electric shock, the una- voidable chatter at reestablishment of contact in the switch ;S will not cause extra shocks to reach the tissue under examination. To avoid extraneous induction effects and disturbances from other electrical conductors and from the capacity of the earth, the electrical circuit shown in the diagram in figure 43 should be as compact as possi- ble. The total length of wire, other than the drop-wire and the resist- ance which was employed in the circuit should be as short as is at all compatible with the other conditions desired for the measurements. The pendulum key was used in the same room with the subject, who was about 10 feet distant from it. The noise made by the action of the device is thus a factor to be considered when it is used for threshold. Fig. 46.—Arrangement for noiselessly catch- ing the pendulum at the end of its swing. R, rubber band, lightly stretched and slightly twisted between points B and C; A, the pendulum arm which, because of its shape and the position of the rubber band, may pass from right to left but can not return; S, leather sleeve to reduce wear and friction on Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Carnegie Institution of Washington. Washington, Carnegie Institution of Washington
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Keywords: ., bookauthorcarnegie, bookcentury1900, bookdecade1910, bookyear1919
