. Manual of mental and physical tests : in two parts : a book of directions compiled with special reference to the experimental study of children in the laboratory or classroom. above. If this is done, there is no reason why therate of effort may not be increased, so as to secure 60 or 120contractions per minute, with a correspondingly more rapidonset of fatigue. If it is desired to compare results obtained by the dynamometer with those obtained by the common form of ergo-graphic experiment, it is suggested that E repeat the experi-ments made upon Chicago school children. For this purposesubst
. Manual of mental and physical tests : in two parts : a book of directions compiled with special reference to the experimental study of children in the laboratory or classroom. above. If this is done, there is no reason why therate of effort may not be increased, so as to secure 60 or 120contractions per minute, with a correspondingly more rapidonset of fatigue. If it is desired to compare results obtained by the dynamometer with those obtained by the common form of ergo-graphic experiment, it is suggested that E repeat the experi-ments made upon Chicago school children. For this purposesubstitute the Mosso ergograph for the dynamometer; use the TEST 9 : ENDURANCE OF GRIP 121 kymograph for securing the graphic record, and the record fur-nished by the endless tape, multiplied by the weight, for thequantitative result. Adjust the weight at 7 per cent, of ;Ssweight, and time the contractions to accord with the beats ofa metronome set at 30, so as to secure 45 lifts in 90 sec. Treatment of Kesults.—This may follow the lines alreadyprescribed. Results.— (1) The measurement of endurance by the use ofthe dynamometer has been tried by Binet and Vaschide, though. FIG. 2o. MOSSO ERGOGRAPH, MODIFIED BY LOMBARD. under conditions somewhat dissimilar to those we have sug-gested, upon a group of boys aged 10-13 years (6) and upon agroup of young men aged about 18 (7). When five (or ten)grips with each hand, alternately, w^ere required, these authorsmade out four types of endurance curve, viz.: (a) a suddendrop, then fairly constant; {!)) an approximately stationary orconstant type, which is quite common; (c) a continuous, butgradual drop, and {(1) a more or less definite rise. The last israther infrequent (it was not found, e. g., by Claviere, in testswith 15 successive grips), but is sometimes given by vigorousindividuals, though the third type is more common for suchsubjects. Practically 90 per cent, of endurance records can, inthe judgment of these writers, be classed in o
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Keywords: ., boo, bookcentury1900, bookdecade1920, booksubjectpsychophysiology
