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An account of a useful discovery to distill double the usual quantity of sea-water, by blowing showers of air up through the distilling liquor : $b and an account of the great benefit of ventilators in many instances, in preserving the health and lives of people, in slave and other transport ships ... also an account of the good effect of blowing showers of air up through milk, thereby to cure the ill taste which is occasioned by some kinds of food of cows.Hales, Stephen

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An account of a useful discovery to distill double the usual quantity of sea-water, by blowing showers of air up through the distilling liquor : $b and an account of the great benefit of ventilators in many instances, in preserving the health and lives of people, in slave and other transport ships ... also an account of the good effect of blowing showers of air up through milk, thereby to cure the ill taste which is occasioned by some kinds of food of cows.

Name: An account of a useful discovery to distill double the usual quantity of sea-water, by blowing showers of air up through the distilling liquor : $b and an account of the great benefit of ventilators in many instances, in preserving the health and lives of people, in slave and other transport ships ... also an account of the good effect of blowing showers of air up through milk, thereby to cure the ill taste which is occasioned by some kinds of food of cows.
Author: Hales, Stephen

Hales, Stephen

Seawater -- Distillation; Ships -- Heating and ventilation

45. Captain _Thomson_ of the _Success Frigate_, in his Letter to me
dated _London, Sept. 25, 1749_, says, “That during the Ventilation,
the Lower-deck Hatches were commonly kept close shut; by which means
the Air was drawn down into the Hold, from between Decks, thro’ the
Seams of the Ceiling, along the Timbers of the Ship; by which means
we found the foul Air soon drawn off from between Decks. Our Rule
for ventilating was for half an Hour every four Hours; but when the
Ventilating was sometimes neglected for eight Hours together, then we
could perceive, especially in hot Weather, a very sensible Difference
by that short Neglect of it; for it would then take a longer Time to
draw off the foul Air. Our general Rule was, to work the Ventilators
till we found the Air from them sweet. We all agreed that they were of
great Service; the Men being so sensible of the Benefit of them, that
they required _no driving_ to work that which they received so much
Benefit by. We found this good Effect from Ventilation, that tho’ there
were near 200 Men on board, for almost a Year, yet I landed them all
well in _Georgia_, notwithstanding they were pressed Men, and delivered
me out of Goals, with Distempers upon them. This is what I believe but
few Transports, or any other Ships, can brag of; nor did I ever meet
the like Good-luck before; which, next to Providence, I impute to the
Benefit received by the Ventilators. It is to be remarked, that we who
lay wind-bound, for four Months, with our Expedition Fleet, which soon
after invaded _France_, were very healthy all the time, when they were
very sickly in all the Ships of that Expedition.

46. “This certainly occasioned all kind of Grain Provisions to keep
better and longer from Weevels, than otherwise they would have done;
and other Kinds of Provisions received Benefit from the Coolness and
Freshness in the Air of the Ship, which was caused by Ventilation.”

47. Mr. _Cramond_ also informs me, that he found the good Effect of
Ventilators on board a Slave-Ship of his with 392 Slaves, twelve of
which were taken on board, just before they sailed from _Guinea_,
ill of a Flux, which twelve all died; but the rest, with all the
_Europeans_ in the Ship, arrived well at _Buenos Ayres_.


 _The following is a Letter to me from Captain_ ELLIS, viz.

  “Sir,

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