[ ^ ] 
monly three of .thefe, (one to each M aft) the Seamen 
are a confiderable time in getting their Apparatus 
ready, and hoifting them up, to make ufe of. idly , 
They can only be ufed in mild Weather, idly, Near 
the Equator, where frefh Air is mod wanted, there 
fometimes happen (uch ftark Calms, that they are 
ufelefs by not having Air enough to diftend them. 
4 thly > The Air hereby admitted pafles only into the 
upper and more open Parts of the Ship, fo that the 
Well, <£?c. receive no Change therefrom ; and it is 
obferved, that fometimes, upon uftng them after fome 
Difcontinuance, they drive offenfive Air into the 
Cabin, and more airy Parts of the Ship ; like as the 
pouring fome frefti into (linking Water makes 
more Water (link, though in a lefs Degree. 5 thly. 
They are improper to be ufed in the Night-time, 
when the People are (leeping between Decks. 
And, Lajlly , admitting they had none of the for- 
mer Inconveniencies, their Ufe mud be deftru&ive 
in Hofpital fhips ; where, though frefh Air imper- 
ceptibly received is absolutely necelfary to pre- 
lerve the Crew as free as poflible from the infectious 
Breath and Exhalations of the difeafed and wounded 
Seamen, yet Blafts of Wind, pouring impetuoufly into 
the very Places where the Sick lie, mull be attended 
with fuch Confequences as are too obvious to mention. 
To remedy thefe Inconveniencies, to prevent Air 
proving foul even in the Wells and Holds of Ships, 
and to caufe imperceptibly a large Circulation of frefh 
Air into every Part of the Ship at all times, Mr. 
Sutton has invented the following Scheme *, which is 
* See thefe Tranfaffiovi, N° 462. />. 42. 
ufeful 
