VII.] 



DISCUSSION OF THE DATA OF STATURE. 



107 



FIG .12. 



contrived more than one form of apparatus by which 

 the probable stature of the children of known parents 

 can be mechanically reckoned. Fig. 12 is a representation 

 of one of them, that is worked with pulleys and weights. 

 A, B, and C are three thin wheels with grooves round 

 their edges. They are screwed 

 together so as to form a single 

 piece that turns easily on its 

 axis. The weights M and F are 

 attached to either end of a thread 

 that passes over the movable 

 pulley D. The pulley itself hangs 

 from a thread which is wrapped 

 two or three times round the 

 groove of B and is then secured 

 to the wheel. The weight SD 

 hangs from a thread that is 

 wrapped two or three times round 

 the groove of A, and is then 

 secured to the wheel. The dia- 

 meter of A is to that of B as 2 

 to 3. Lastly, a thread is wrapped 

 in the opposite direction round 

 the wheel C, which may have 

 any convenient diameter, and is 

 attached to a counterpoise. M refers to the male statures, 

 F to the female ones, S to the Sons, D to the Daughters. 

 The scale of Female Statures differs from that of the 

 Males, each Female height being laid down in the 

 position which would be occupied by its male equivalent. 



