6t Dcj'criplion of a new Diving Machine'. 



and likewife round the arms. The cafe is the fame with 



the driwers, which are bound clofe round the knees. 



4 rcprcfents a brafs elaftic Iwtijdage, employed for 

 fattening on the jacket, and which, when liooked together, is 

 [brewed fa ft by means of the fcrcwy, three inches in length. 

 A brafs bandage is hereufed, becaufe leather is apt to ftretch, 

 and on that account might be dangerous. 



Fig. 5 is the mouth-piece to which the pipes xy are 

 fa'tened, and which is fcrewed on at f (fig- a); *-*s the 

 fcrew; u the part that goes into the machine, and which is 

 taken into the mouth : v the exterior part of it, in which 

 there is a partition -zv in order to feparate the pipes; and a 

 is an aperture, that the air in the machine may communi- 

 cate with the pipe jj'. 



The internal diameter of thefe tubes is three fourths of 

 an inch Rhinlandifh. '] hey eenfift of ftrong brafs wire i l T 

 line, in thicknefs, wound into a fpiral form, and covered 

 with ftrong leather. In order to fave expence, fix yards of 

 the pipe, from the mouth-piece, maybe made in this man- 

 ner, and the reft of tubes of tin-plate three or four yards 

 in length, joined together with pieces of leather-pipe about 

 prepared in the firft manner. 



The refervoir a (fig. i), applied in fuch a manner that it 

 can be fcrewed oft', is for the purpofe of collecting the final) 

 quantity of water that might force itfelf into the breathing 

 pipe when long ufed, and which otherwife would be in 

 continual motion and render breathing disagreeable. 



To prevent tire, leather from becoming hard, and to clofe 

 <up its porcfc, iV.that it may be rendered water-tight, the fol- 

 lowing mixture was rubbed over it: viz. 6 parts of wax, 

 3 of Venoti^f^'tur-pentine, 2 of pitch, and 2 of melted hogs- 

 lard. J ,o.(to be obferved, that the beft and ftrongeft 

 leather muil-be ufed for the tubes, and that ftripes of leather 

 mull be fw.xd very'cloftly on the feams of the jacket and 

 drawers* 



If 



