SCO 



SLANTING DIRECTION OF THE SHOULDER. 



comparatively restricted. The slightest inspection of this cut, or of that at 

 page 140, ^vill show that, just in proportion as the point of the shoulder is 

 brought forward and elevated, will be the forward action and elevation of 

 the limb, or the space passed over at every effort. 



The slanting shoulder accomplishes a most useful object. The muscles 

 extending over the shoulder-blade to the lovv-er bone of the shoulder are 

 the power by which motion is given to the whole of the limb. The extent 

 and energy of that motion depend much on the force exerted or the strength 

 of the muscle, but there are circumstances in the relative situations of the 

 different bones which have far gi'eater influence. 



Let it be supposed that, by means of a lever, some one is endeavouring 

 to raise a certain weight. 



A is a level', resting or turning on the pivot B ; C is the weight to be 

 raised; and D is the power, or the situation at which the power is applied. 

 If the strength is applied in a direction perpendicular to the lever, as re- 

 presented by the line, E, the power which must be exerted can easil}' be 

 calculated. 



In propoi'tion as the distance of the power from the pivot or centre of 

 motion exceeds that of the weight from the same place, so will be the ad- 



