lo An. Acctrunt of a. nevj Method 



the labour and time wliich are expended in caufing them to 

 reach the bell. The mode of fuppK which Mr. Healy eon- 

 tri\'ed appears much calculated to remedy thefe inconveni- 

 ences. A recital of the circuml^ances that attended Mr, 

 Healy's experiment, it i? hoped, will not prove uniuterefting. 



Captain Lonfdale, ot the Experiment, was employed to 

 raifeabrig which had foundered, in the vear 1799, in the 

 Bay of Dubhn, between Dunleary and Howth. Ttiis he 

 endeavoured to accomplifli by faflening chains round the 

 bow and (tern of the funkeii veiTcl, and by connefting to 

 thefe a ring on eacli fide^ through which cables palfcd, and 

 were !a(hed at low water acrofs the deck of his fliip, that 

 afted a> a haoy. Confequentlv, on the tide riling, if the 

 fjiteiniigs had not given way, the floating veflel mull either 

 have funk itfelf, or drawn the otlicr upwards. 



Mr. Healy accompanied captain Lonfdale in this attempt, 

 in order to put in pra<Aice his mode of fupplying a diving- 

 bell with air. The bell, which refembled a truncated cone, 

 was made of wood, confiiting of ftaves united by cooperage : 

 the month was two feet and a half in diameter ; the top (me 

 foot and a half: the height was four feet. Windows were 

 jjlaced at proper diftances round the fides, and one at the 

 top : there was alfo an aperture in the top for letting out 

 foul air. In the infide was fufpended a ftage for the purpofe 

 of reiiing on. On the top was fixed an iron eye, through 

 which a cable paiFed for raifing or lowering the bell. This 

 eye was fecured to the bell by four iron bars, of an inch 

 fquare, that went dowii the fides and lapped under its edges. 

 Witliin fix inches of the bottom was fixed a broad iron hoop, 

 of an inch thicknefs, from which weights were fufpended to 

 fink the bell. 



On the {hip's deck was laflied a forcing or condenfing fy- 

 ring«, capable of containing about tw^o quarts, to xvhich were 

 connected five fathom of iron tube, and to the end of this an 

 eqiwl length of leathern lube that turned into the bell. When 

 the pifion was dtpreiied, the contained air pafl'ed throu<ji;h the 

 Iwhes, and was forced into the bell. Thus a conlUmt ilream 

 of air was forced down. 



fovjr hundred weight and a half being fufpended in the 

 fiianncr defcribed, i\]r. llealv w-as firft let down rapidly, 

 when, on fignifviog his defire of afcending, his wifli was im- 

 mediately complied with. He liated, that great uneafincfs 

 was felt, particularly in his ears, from fnrli a Hidden defceni; 

 that there was fufficitnt liglu in the bell to enaWe him to 

 read by light reflected through the mouth of the bell without 

 removiua; the ihutters of any of the windows 5 and alfo that 



he 



