Defeription of a Ventilator, &e. 393 
pulleys G,G, are brought round, and their ends, having 
hooks for that purpofe, are hitched into ftaples fixed to the 
front of the cart or other carriage: within thefe ropes the 
load H is placed on a common pulley I, which forms an in- 
clined plane, up which, by the turning of the winch, the 
ropes are wound upon the barrels, and the load raifed into 
the carriage. 
« KK, the frame, intended to reprefent the part of the cart, 
or other carriage, on which the machine is occafionally to 
be placed. 
‘ The whole of the barrels and cogged wheels are contained 
in an iron box L, the fides of which are reprefented in the 
figure as taken off, that the conftruction of the feveral parts 
may be thewn. 
Mil: Deferipiion ofc cbeap and efficacious Ventilator for 
_ preferving Corn on Ship-board. By Tuomas SourtnH, 
Ejq.*. 
“Due importation of grain is a precarious traffic. The 
produce of diftant countries, or even of thofe near home, 
when long in colle&ting, or long detained on fhip-board, is 
fubject to heat, foon becomes fetid, and is often fo far fpoiled .. 
and depreciated in its value as to fell for lefs than the original 
eoft. Herice the merchant, overwhelmed with loffes, regrets 
his patriotifm, grows fhy of importation, and, unlefs invited 
by a certainty of gain, drops the trade, even whilit the na-~ 
tion ftands in need of fupplies. . 
The remedy here propofed is a fimple, cheap, and, I truft, 
efficacious method of ventilating grain whilft confined on 
fhip-board ; fufficient, I prefume, to keep it {weet and mar 
ketable after fuftaining a tedious voyage. 
Defeription of the Ventilator, with References to the Figures 
thereof. (See Plate VII.) 
Fig. 1. is a cylindrical air-yeifel or forcing-pump, of lead, 
* From the Letters and Papers of the Bath and Weft-of-England Society 
for the Encouragement of Agriculture, 8c, 
VoL. V. 3E tin, 
