Specification of Dugald Campbell : treating sewage, &c.

  • Campbell, Dugald.
Date:
1872
Catalogue details

Licence: Public Domain Mark

Credit: Specification of Dugald Campbell : treating sewage, &c. Source: Wellcome Collection.

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    Provisional Specification. 2 Campbell's Improved Process for Treating Sewage, fyc. acid, and in preference to others in either sulphuric or hydrochloric acid, as being more economical, and I apply the solution so obtained to the sewage, adding before or after, but preferably after, either a milk or cream of lime, or preferably a milk or cream of magnesia and lime prepared from magnesian limestone, in quantity sufficient to neutralize 5 the acid which was in the acid phosphate of lime added to the sewage. SPECIFICATION in pursuance of the conditions of the Letters Patent, filed by the said Dugald Campbell in the Great Seal Patent Office on the 27th September 1872. TO ALL TO WHOM THESE PRESENTS SHALL COME, I, Dugald 10 Campbell, Consulting and Analytical Chemist, 7, Quality Court, Chancery Lane, London, Middlesex, send greeting. WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters Patent, bearing date the Thirtieth day of March, in the year of our Lord One thousand eight hundred and seventy-two, in the thirty- 15 fifth year of Her reign, did, for Herself, Her heirs and successors, give and grant unto me, the said Dugald Campbell, Her special licence that I, the said Dugald Campbell, my executors, administrators, and assigns, or such others as I, the said Dugald Campbell, my executors, adminis¬ trators, and assigns, should at any time agree with, and no others, from 20 time to time and at all times thereafter during the term therein expressed, should and lawfully might make, use, exercise, and vend, within the United Kingdom of Great Britain and Ireland, the Channel Islands, and Isle of Man, an Invention for “ Ax Improved Process for the Treatment of Sewage and the Production of Manures therefrom,” upon 25 the condition (amongst others) that I, the said Dugald Campbell, my executors or administrators, by an instrument in writing under my, or their, or one of their hands and seals, should particularly describe and ascertain the nature of the said Invention, and in what manner the same was to be performed, and cause the same to be filed in the Great Seal 30 Patent Office within six calendar months next and immediately after the date of the said Letters Patent. NOW KNOW YE, that I, the said Dugald Campbell, do hereby declare the nature of my said Invention, and in what manner the same is to be