. 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. s at present somewhatconfused (Cf. E. Jones. PsBu, 6: April, 1909). The terms index ofunidexterity and index of dextrallty have been used by some writersas equivalent to index of right-handedness. Dextrality is here usedto indicate the superiority of one hand (whether right or left) over theother. TEST G; STRENGTH OF GRIP 101 Apparatus. — Improved form of Smedleys dynamometer(Fig. 14). Millimeter rule. Method. — With t
. 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. s at present somewhatconfused (Cf. E. Jones. PsBu, 6: April, 1909). The terms index ofunidexterity and index of dextrallty have been used by some writersas equivalent to index of right-handedness. Dextrality is here usedto indicate the superiority of one hand (whether right or left) over theother. TEST G; STRENGTH OF GRIP 101 Apparatus. — Improved form of Smedleys dynamometer(Fig. 14). Millimeter rule. Method. — With the millimeter rule, measure the distancefrom where ;Sfs thumb joins his hand to th^Tend of his the dynamometer by whirling the inner ^stirrup untilthe scale on the outer stirrup indicates one-half this should bring the second phalanx to bear against the innerstirrup, and will Ordinarily prove to be the optimal adjust-ment; if not, it may be modified to suit Ss inclinations. Thenset the instrument by means of the clutch, so that the innerstirrup cannot twist while in use, and record the adjustmentby reference to the scale upon the FIG. 14. DYNAMOMETER AND DYNAMOGRAPH, AFTEPw SMEDLEY, IMPRONED. Illustrate the use of the instrument to S; especially makeclear that the lower pointer will register the grip, so that hedoes not have to continue his effort while the scale is read. Allow three trials with each hand, right and left alternately,but introduce a brief pause, say 10 seconds, between each trialto avoid excessive fatigue. Have >Sf exert his maximal grip, andin each trial encourage him to do his best. Record the amountregistered at each trial; but, for ordinary purposes, use in sub-sequent computation only the highest record for each hand. 102 PlIVSICAr. AND MOTOR CAPACITY Records obtained upon the d^vnamometer. as nearly all investigatorshave pointed out. are very liable to be affected by subjective who are. by a
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