Copy 1

An account of some experiments and observations on tar-water: wherein is shown the quantity of tar that is therein. And also a method proposed, both to abate that quantity considerably, and to ascertain the strength of the tar-water / Which was read before the Royal society. By Stephen Hales.

  • Stephen Hales
Date:
1745
Catalogue details

Licence: Public Domain Mark

Credit: An account of some experiments and observations on tar-water: wherein is shown the quantity of tar that is therein. And also a method proposed, both to abate that quantity considerably, and to ascertain the strength of the tar-water / Which was read before the Royal society. By Stephen Hales. Source: Wellcome Collection.

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    dropping five times on it: And but fix Grains in a like Quantity of Tar- water, made by dropping coarfe Ame¬ rican Tar five times on the fame Wa¬ ter ■) whereas in a Pint of Tar-water made by ftirring fome of the fame Tar, there remained twenty-eight Grains of fyrupy Tar, Numb. 3. But this'Tar-water thus prepared, was not fo ftrong as the ftirred Tar-water, tho’ it had a confiderable Degree of Strength, fufficient probably for many Cafes ; and if requifite may be made ftronger, by more repeated Droppings. By this means there is a large Surface of Tar expofed to the- Water, to be thereby impregnated with the Virtue oi the Tar, without forcing in the grafter Parts, by ftirring with a Stick : For it feems probable, that there is not fo great a quantity of the Surface of the Tar ex¬ pofed to the immediate Contact of the Water in ftirring fo ftiff a Mafs of Tar, as in the dropping way. This being fomething like Nature’s Method
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