FORCE AND MOTION. 



37 



FIG. 10. 



weights being the same as the ratio between the corres- 

 ponding adjacent sides of the wooden parallelogram. A 

 weight of 120 ounces is hung from the corner A. When 

 the wooden frame comes to rest it will be found that the 

 sides AB and AC lie in the direction of the cords which 

 form their prolongations. These sides AB and AC are 

 accurate graphic representations of the two forces acting 

 upon the point A. It will be further found that the 

 diagonal AD is vertical and twice as long as the side AC. 

 Since the side AC represents a force of 60 ounces, AD will 

 represent a force of twice 60 ounces or 120 ounces. We 

 thus see that AD fairly represents the resultant of the 

 two forces due to the gravity of W and w, for this result' 



