aga Gefferal PriAciptis and Cenjlru^ion of a Sub-iftarine Vejel. 



Wherever the ejtternal apparatus pafled through the body of the veflcl, the joints \^ere 

 round, and formed by brafs pipes, which were driven into the wood of the vefTel, the holes 

 through the pipes were very exaftly made, and the iron rods, which pafled through them, 

 were turned in a lathe to fit them ; the joints were alfo kept full of oil, to prevent ruft 

 and leaking. Particular attention was given to bring every part, neceflary for performing 

 the operations, both within and without the vcflel, before the operator, and as conveni- 

 ently as could be devifed ; fo that every thing might be found in the dark, except the 

 water-gauge and the compafs, which were vifible by the light of the phofphorus, and 

 nothing required the operator to turn to the right hand, or to the left, to perform any 

 thing neceflary. 



No. 2.. 



Defcr'tption of a tnagazine and its appendages^ deftgned to be conveyed by the fub-mar'me veftl ti 



thebottom of a fliip. 



In the forepart of the brim of the crown of the fub-marine veflel, was a focket, and an 

 iron tube, pafling through the focket ; the tube flood upright, and could Aide up and 

 down in the focket, fix inches: at the top of the tube, was a wood fcrew (A) fixed by 

 means of a rod, which pafled through the tube, and fcrcwed the wood fcrew faft upon 

 the top of the tube : by pufliing the wood fcrew up againft the bottom of a (liip, and 

 turning it at the fame time, it would enter the planks; driving would alfo anfwer the 

 fame purpofe ; when the wood fcrew was firmly fixed, it could be caft ofi^ by unfcrewinj 

 the rod, which faftened it upon the top of the tube. 



Behind the fub-marine veflel, was a place, above the rudder, for carrying a large 

 powder magazine, this was made of two pieces of oak timber, large enough when hollowed 

 out to contain one hundred and fifty pounds of powder, with the apparatus ufed in firing 

 it, and was fecured in its place by a fcrew, turned by the operator. A ftrong piece of 

 rope extended from the magazine to the wood fcrew (A) above mentioned, and was 

 faftened to bdth. When the wood fcrew was fixed, and to be caft off from its tube, the 

 magazine was to be caft off likewife by unfcrewing it, leaving it hanging to the wood 

 fcrew ; it was lighter than the water, that it might rife up againft the obje<a, to which the 

 ■wood fcrew and itfelf were fattened. 



Within the magazine was an apparatus, conftru£led to run any propofed length of time, 

 wnder twelve hours; when it had run out its time, it unpinioned a ftrong lock refenibling a 

 gun lock, which gave fire to the powder. This apparatus was fo pinioned, that it could 

 not poffibly move, till, by cafting off the magazine from the veffel, it was fet in motion. 



The flcilful operator could fwim fo low on the furface of.the water, as to approach very 

 near a (hip, in the night, without fear of being difcovered, and might, if he cbofe, ap- 

 proach the ftem or ftern above water, with very little danger. He could fink very quickly, 

 keep at any depth he pleafed, and row a great diftance in any direftion he defired, without 

 coming to the furface, and when he rofe to the furface, he could ft»on obtain a frefh fupply 

 «f avr, when, if neceffary, he might defcend again, and purfuehls courfc. 



•No. 



