United States or American Samoa ? Vote for the TOP Country of the Week !
Besides, I had read articles about the chronoscope, the plethysmograph, the sphygmograph, and others of the new psychological instruments. Craig carried it off, however, as if he did that sort of thing as an every-day employment.
The clock used for exact work is likely to be the Hipp chronoscope, which gives on its dials indications of time intervals in thousandths of a second. For the sake of keeping the conditions constant and preventing disturbance, the wires are made long, so that the clock and the experimenter may be in one room, while the bell, the punch key, and the subject are in another, with the door closed.
It was worked by two circuits, and as the type revolved a hammer, actuated by the current, pressed the required letter on the paper. In 1840 Wheatstone also brought out his magneto-electrical machine for generating continuous currents, and his chronoscope, for measuring minute intervals of time, which was used in determining the speed of a bullet or the passage of a star.
For this purpose a mouth key was used which made it possible for the subject simply by emitting a puff of breath from the lips, to break an electric current and thus stop the chronoscope as soon as possible after hearing the signal.
That is not seldom sufficient to secure the diagnosis of complex mental variations. The method yields still more if the time for such a reply is measured, but there again not the costly chronoscope of the laboratory is indispensable; a simple stop watch which gives the fifths of a second would be fully sufficient for all practical purposes.
We must think of it as a growing, developing thing, showing its stages of evolution in the ascending animal scale, and also in the unfolding of the child; as revealing its nature in every change of our daily lives which we experience and tell to one another or find ourselves unable to tell; as allowing itself to be discovered in the laboratory, and as willing to leave the marks of its activity on the scientist's blackened drum and the dial of the chronoscope; as subject to the limitations of health and disease, needing to be handled with all the resources of the asylum, the reformatory, the jail, as well as with the delicacy needed to rear the sensitive girl or to win the love of the bashful maid; as manifesting itself in the development of humanity from the first rude contrivances for the use of fire, the first organizations for defence, and the first inscriptions of picture writing, up to the modern inventions in electricity, the complex constitutions of government, and the classic productions of literary art; and as revealing its possibilities finally in the brutal acts of the mob, the crimes of a lynching party, and the deeds of collective righteousness performed by our humane and religious societies.
The chronoscope here measures the reaction times and association times in thousandths of a second; the kymograph, by the help of the sphygmograph, writes the record of the pulse and its changes in emotional states, while the pneumograph records the variations of breathing, and the plethysmograph shows the changes in the filling of blood vessels in the limbs which is immediately related to the blood supply of the brain.
Word Of The Day