470 



TRANSACTIONS OF THE AMERICAN INSTITUTE. 



carriage apart, and ermine the surfaces of the parts. Wherever the 

 coincidence does occur, the wood will be worn smooth; let this be removed 

 in the slightest manner, and the surfaces corrected generally, which will 

 be found to reduce the recoil; but remember that, in making a plane sur- 

 face, it is by no means necessary to make it smooth; it should be as little 

 so as possible for the present purpose. 



If the carriage moves out on the slide with difficulty when the compres- 

 sors are free, it is owing to the guide in the slot having swelled or warped, 



and will be easily remedied by removing a very slight shaving from its 

 Bides. 



