[ 44 ] 
run or be drawn out that way, and frefli Air from 
the adjacent Parts will fucceed in its room. 
It ii upon thefe Principles that the following 
Scheme is mod humbly offered to the Right Honour- 
able the Lords of the Admiralty, and Commiflioners 
of the Navy, which it is hoped will be found effedual 
for clearing the bad and corrupted Air from the Holds 
and other clofe Parts of his M aj est y's Ships 5 and 
thereby prove beneficial to the Public, bypreferving 
the Healths of many of his Majesty’s good Sub- 
jects ferving on board the fame; the whole thing be- 
ing indeed eafy to be executed, and what will no- ways 
incumber, or be troublefome, in any of the Veflels 
where it fhall happen to be applied ; the fame being, 
in fhort, no more than this : That whereas in every 
Ship of any Bulk there is already provided a Copper 
or Boiling-place proportionable to the Size of the 
Veffel, it is propofed to clear the bad Air by means 
of the Fire already ufed under the faid Coppers or 
Boiling-places, for the neceffary Ufes of the Ship. 
It is well known, that under every fuch Copper 
or Boiler, there are placed two Holes feparated by a 
Grate; the firft of which is for the Fire, and the 
other for the Afhes falling from the fame ; and that 
there is alfo a Flue from the Fire-place upward, by 
which the Smoke of the Fire is difeharged at fome 
convenient Place of the Ship. 
It is alfo well known, that the Fire once lighted in 
thefe Fire-places, is only preferved by the conftant 
Draught of Air through the forementioned two 
Holes and Flue ; and that if the faid two Holes are 
clofely flopp’d up, the Fire, though burning ever fo 
briskly before, is immediately put out. 
But 
