BARRELS. 11 



before the shot has reached the object. It is one 

 thing to speak of things plausibly, another to state 

 them correctly. 



In the following schedule I have taken three of 

 the largest sized guns, because a little sporting gun 

 is on so small a scale, that although the relief may 

 befelt in a moment by passing a proper gauge through 

 the caliber, yet the barrel is so diminutive, that it 

 would be difficult to measure, and specify, the exact 

 depth of this relief. 



N. B. If any gunmaker had candidly informed me 

 as to his mode of boring barrels, I should have felt 

 myself bound in honour never to divulge, much less 

 to publish, the secret. But as the little knowledge 

 I possess has been acquired by my own discovery, 

 and proved by experiments to be correct, it becomes 

 my own property ; and as such therefore I have no 

 further hesitation in presenting it to my readers. 



A SINGLE SWIVEL-GUN. 



Barrel made by Fullerd : average of bore, an inch 

 and \ : weight of barrel 621bs. 



Feet. Inches. 



Cylinder . .28 



Relief . . .41 



Opened behind . . 6 



Total (exclusive of plug) 7 3 



DEPTH OF CUT. Relieved to the 20th of an 

 inch : opened behind to the 24th of an inch. 



