
ABSCISSA = WEIGHT. 
USEFUL EFFECT. ORDINATE ="USEFUL EFFECT. 





MB Jevons’ ExperilMents NOI. 
THROWING weleee WITH. ARM. 
2 
Iz + a) 
2 
a)(3x +a) 
262-2 
8:4 



28 
CuRVe oF USEFUL EFFECT, 

ABSCISSA = WEIGHT. 
ORDINATE= USEFUL EFFECT. 
MR Jevons’ ExpPerRIMENTS N° 2 
LIFTING WEIGHTS WITH PULLEY & CORD. 
Ne? 
¥y¥ro= |A = 19107 
EQUILATERAL| HYPERBOLA 



° 
a 2 
AZ (3sx+a) 
(2x2 + ajt 
Curve oF USEFUL] EFFECT. 

ABSCISSA = weicut 
ORDINATE = VSEFUL EFFECT. 
M® Jevons’ Experiments N°3 
hsisind WEIGHTS pN HORIZONTAL! ARM, 








