A simple method of water analysis : especially designed for the use of medical officers of health / by John C. Thresh.

Date:
1897
Catalogue details

Licence: Public Domain Mark

Credit: A simple method of water analysis : especially designed for the use of medical officers of health / by John C. Thresh. Source: Wellcome Collection.

Provider: This material has been provided by the Royal College of Physicians of Edinburgh. The original may be consulted at the Royal College of Physicians of Edinburgh.

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    Examination of a Samplk of Skwa(;k mum a Sewage Farm, collected at End of Main Sewer No. 21. Odober, 1896 Chemical and Physical Examinalion. 1. Colour in Q-in. cohimn.—Distinctly j'ellow-brown. Turhiclity.—Contained much flocculent matter. 2. Odour.—Strongly urinous. 3. Residue left on evajmation.—Voluminous, brown. Charred when ignited, and an unpleasant odour evolved. 4. Free ammonia.—Very abundant. 5. Chlorine.—About 8 grains per gallon. Ecfuiva- lent of common salt.—About 13 grains per gallon. 6. Nitrites.—Trace. 7. Nitrates.—About h grain N per gallon. 8. Hardness.—About 18°. 9. Lead.—None. 10. Zinc, iron, and cop]}er.—None. 11. Oxygen absorbed in 15 min. at 212° F.—About 2 grains per gallon. A typical sample of town sewage.