APPARATUS FOR DRIVING COPPER BOLTS INTO SHIPS. 37 



the experiment of driving copper bolts through the jointed Evidence oQjgi 

 cylinder invented by Mr. Phillips ; and that they fo far approve utiht 5 r ' 

 of it, that they mean to adopt the general ufe of them, for 

 driving bolts in all directions, particularly on the outfule of 

 fhips, whether iron or copper; as this method not only pre- 

 vents the bolts from bending, but keeps the heads from Split- 

 ting, and enables the bolts to be driven much tighter, than by 

 any other means with which they were acquainted. They fur- 

 ther add, that by the application of Mr. Phillips's cylinder and 

 punch, a copper bolt which had been crippled at the edge of 

 the hole, and which could not be ftarted by a mall, went up 

 with eafe in a perpendicular direction in the flat of a (hip's bot- 

 tom, not four feet from the ground. 



This certificate was witnefled by Mr. William Holden. 



The fame facts are alfo certified by Mr. Thomas Walker, 

 and Mr. James M. Hillhoufe, of Briftol, who add their opinion, 

 that the adoption of this invention in the different dock-yards 

 of the kingdom, will prove very advantageous. 



Since Mr. Phillips's firft application to the Society for a pre* 

 mium, he has made a confiderable improvement in the con- 

 flruclion of his tubes. The defcription and engraving hereun- 

 to annexed are of the improved kind : models of both are, how- 

 ever, preferved in the Society's repofitory, for public infpec- 

 tion. 



The inftrument employed for driving the bolts, confiils of a Defcription. 

 hollow tube formed from feparate pieces of caft iron, which 

 are placed upon the heads of each other, and firmly held thereto 

 by iron circles or rings over the joints of the tubes. The lowed 

 ring is pointed, to keep the tube fteady upon the wood. The 

 bolt being entered into the end of the hole bored in the wood 

 of the (hip, and completely covered by the iron tube, is driven 

 forward within the cylinder by an iron or fteel punch, placed 

 againft the head of the bolt, which punch is (truck by a mall : 

 and as the bolt goes further into the wood, parts of the tubes 

 are unferewed and taken off, till the bolt is driven home into 

 its place up to the head. 



The tubes are about five inches in circumference, and will 

 admit a bolt of feven-eighths of an inch in diameter. 



Reference 



