PROCEEDINGS OF THE POLYTECHNIC ASSOCIATION. 



471 



With all the care that can possibly be taken in selecting seasoned stuff 

 it is well known that the continued exposure alternately to sun and rain, 

 incidental to sea service, will after a while warp material of .the best 

 quality, and, therefore, it will be necessary, with a new carriage, to exam- 

 ine it occasionally, and correct the evil. 



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With very little attention, the compressors will be found to perform their 

 part in controlling the recoil even of the most active of these pieces. 



The force of recoil thus resisted may be appreciated by the fact that this 

 piece, being mounted in the bow of a frigate's third cutter, 211 feet in 

 length, with at least twelve persons in, besides the gun, ammunition, oars, 



