Periodic variations in efficiency : as shown in mental and physical tests, together with some weather effects / by Archibald G. Peaks.

  • Peaks, Archibald G. (Archibald Garfield), 1880-1918.
Date:
1921
Catalogue details

Licence: In copyright

Credit: Periodic variations in efficiency : as shown in mental and physical tests, together with some weather effects / by Archibald G. Peaks. Source: Wellcome Collection.

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    Group IV, consisting of the twenty-one pupils between 13 and 14 years of age, were tested between 9 a. ip. and 10 a. m. once each week from August 12, 1904, to March 3i, 1905- Group V, consisting of ten pupils between 12 and 13 years of age, were tested between 10 a. m. and 12 rp. on each school day from January 12, 1906, to June 1, 1906, and again from August 12, 1906 to December 21, 1906. In these tests, Lehman’s Ergograph was used. The tests were carefully controlled and the children were urged to compete with each other for high records. Before taking the tests each boy was asked to dry his hand on a to,wel. Each boy then took four grips with an interval of four seconds between at a uniform tempo. The averages of these four trials are shown in the tables for results. Each boy used only his most dextrous hand in making records. Before the real tests, each boy was allowed to make a number of trials, so as to learn to grip in a uniform tempo, which was the same for all so far as possible. Whenever a pupil was absent, ill, or otherwise indisposed, or did hot wish to grip (which happened very seldom), an average grip was worked out for him from the days preceding and following, and put in its place. Pupils who were absent for a long period were not included in tabulating the results. (4) Results. The more general of the results from the individual tests, are as follows: The curve of Lehman (who was 47 years old), “sinks in the fall to the middle of December, then rises, first slowly, then more quickly to the end of June. It sinks during July and August, rises abruptly in September, and sinks grad¬ ually to the end of the tests in December.” The curve of Pedersen (who was 36 years old), is very “similar to that of Lehman during most of the time.” The curve of Miss J. (who was 18 years old), and Group V of the boys, who were also tested from January to Decern-