ANTHROPOMETRY 



71 



The compass is then slightly raised to assure penetration as far as 

 the guards allow, is taken hold of a short distance above the scale by 

 the left hand, allowed to sag down by its own weight, and held in posi- 

 tion. The ulnar side of the hand that holds the compass should for 

 greater steadiness repose on the head of the subject behind the in- 

 strument. The scale of the compass is now brought as near as possible 



Fig. 13. Method of holding the instrument in measuring the height of the head. 



over the bregma, the spread of the branches of the compass is noted 

 on the scale, the distance from bregma to lowest part of the scale is 

 carefully ascertained by the rod of the sliding compass, and the 

 operation is completed. All that is now necessary is to read off on a 

 previously prepared scale the total height from the base line of the 

 points of the compass to the lowest part of the scale of the same at 

 the spread observed in the subject at hand, and to deduct from this 

 the distance between the bregma and the scale. Special care must 

 be exercised that neither of the branches (particularly that in the right 

 ear) slip out of the meatus. (Fig. 13). 



