DYNAMOMETER FOR ROTARY MOTION. IZ / 



by the arrow, it causes the two cog-wheels to levolve, 



Dynamometer for measuring the force and velocity of thrashing-machines. 



and moves the band in the direction shown by the oth- 

 er arrow. Now, whatever force is required to turn the 

 wheel,/, connected with the machine under trial, must 

 be overcome by a corresponding force applied to the 

 handle, a, because the wheel-work is so adjusted that 

 this handle moves with the same velocity as the band 

 on the band- wheels. 



The wheel, /, being connected by the band to the 

 wheel, d, which is on the same axis or shaft as the cog- 

 wheel, /, the resistance of the machine under trial tends 

 to keep the cog-wheel, /, from turning, until enough 

 force is apphed to the handle, a, to set the cog-wheel, 

 k, in motion. Now the greater the resistance, the 

 greater will be the power needed at the handle. This 



