No- 144.] 107 



I cannot permit this occasion to pass without expressing the 

 great satisfaction I have experienced from the use of your simple 

 contrivance for connecting the motion of the driving clock -with 

 the polar axis. This may be called a detached connection, for 

 without interfering with the movement of the clock, it permits 

 the observer to turn the telescope in any direction, thus enabling 

 him to compensate for any errors of the clock motion, or turn to 

 a different object without leaving the eye piece or throwing the 

 clock out of gear. L. M. R. 



