THE PRINCIPLES OF MYODYNAMICS. 



149 



THE MYOMETER. 



136. It is now desirable to add some points 

 of experimental evidence afforded by a machine 

 that, for the sake of convenience, may be called 

 a niyometer. This machine is made as follows : 

 (i.) A bar of wood five and one-half feet long, 

 whose cross section is about one and one-half 

 inch square, is morticed from side to side in two 

 directions, for about five inches in the center, so 

 as to leave a small quadrangular piece at each 

 corner — the mortices, or slots, meeting at right 

 angles. About an inch beyond the mortices on 

 one end the bar is cut transversely by a saw, as 

 far as the opposite side of the mortice, and then 

 slit from the end down to the transverse saw 

 cut. Then an opening is made down through 

 to the mortices as large as the central opening 

 of the two mortices. (2.) Another bar of wood 

 about two feet long is made to fit into one of 

 the mortices in the long bar ; and an iron pin 

 goes through the short bar transversely, and 

 plays up and down in the other mortice. (3.) 



