Account of the qualities and uses of coal tar and coal varnish. With certificates from shipmasters and others / [Anon].

  • Archibald Cochrane, 9th Earl of Dundonald
Date:
1784
Catalogue details

Licence: Public Domain Mark

Credit: Account of the qualities and uses of coal tar and coal varnish. With certificates from shipmasters and others / [Anon]. Source: Wellcome Collection.

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    \ A C C O U N T, &c. ''HE E arl of Dundonald, in 1780, difcover- JL ed a new and eafy method of extraffing tar from coal ; for which a patent was obtained for the term of fourteen years. Many trials for extrading tar from coal had been made by the late Marquis of Rockingham, near Sheffield, and by various perfons at Colebrook-dale, and at NewcafUe, under the direction of a German, calling himfelf Baron Van Haak. The quantity made by thefe different attempts was trifling, and the expence of the procefs fo great, that the tar could not be fold to profit by the ma- nufadurers, under twenty-eight fhillings per barrel. The following defcription of the ufes and qualities, and manner of making ufe of coal tar, together with a variety of very ample certificates, will, it is hoped, prove fatisfa&ory to the public, who may be fupplied from Lord Dundonalcfs manufacture with tar and varnifh, at the price of foreign tar, and of turpentine varnifh; and, in one refpedt, coal tar may be regarded as one-third cheaper than common tar, lince an equal quantity of the former covers one third fuperficies more than the latter. Coal tar is of a blacker colour than common tar, and entirely free from water; of which there is a confiderable quantity in the latter. It needs no mixtureoflamp-blackfordoingthe maft-heads,yards, timber-heads, and blacking ftrokes of ffiips. It lays A 2 on
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