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60
Master, Mr. Draper, and class teachers, Messrs. Campbell and Barber, gave great help, and materially
aided the working out of the fatigue figures.
At first the results of the tests were set out diagrammatically, marking off horizontally numbers
to represent the numbers of sums done rightly by different groups of boys, and then marking vertically
the number of boys in each group. Curves were got for each test, and on superimposing these curves
displacement to the right or left indicated improvement or deterioration in the mental capacity of
the boys.
Diagram shewing deterioration of groups of boys getting fewer correct sums in the II. test.
To express the gain or loss in figures the total number of sums multiplied by the number of boys
working them correctly was averaged among the boys, and the gain or loss in the average taken.
The later method was, however, always to give twenty simple multiplications of three integers
and represent this multiplied by the number of boys as a rectangle, whose surface was equal to this
number of squares, then the right, wrong, and omitted sums could be recorded by light lined or stippled
squares on the rectangle, and the actual numbers taken in percentages gave a numerical estimate as
shewn below.
For instance, the records of observations on January 9th, 1907, were :-
26 boys and 20 sums = 520
1. Right 446 = 85.77% II. Right 406 = 76.15%
Wrong 53 = 10.20% Wrong 52 = 10.00%
Omitted 21 = 4.03% Omitted 62 = 13.85%
520 = 100.00% 520 = 100.00%