Service-pipes for water : an investigation made at the suggestion of the Board of Consulting Physicians of Boston / by E.N. Horsford.

  • Horsford, Eben Norton, 1818-1893.
Date:
1849
Catalogue details

Licence: Public Domain Mark

Credit: Service-pipes for water : an investigation made at the suggestion of the Board of Consulting Physicians of Boston / by E.N. Horsford. Source: Wellcome Collection.

Provider: This material has been provided by the National Library of Medicine (U.S.), through the Medical Heritage Library. The original may be consulted at the National Library of Medicine (U.S.)

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    *' 11 Table IV. Experiments with Three Bars. Other conditions same as before. Days. Cochituate. Croton. Fairmount. Jamaica. 1 1.000 0.500 0.500 10.000 3 10.000 2.000 1.000 4.000 4 5.000 0.500 3.000 40.000 5 0.000 0.500 1.000 15.000 6 1.000 0.200 0.100 10.000 7 0.500 0.100 0.100 8.000 8 0.100 0.100 0.100 4.000 11 0.100 0.200 0.200 2.000 12 0.100 0.100 0.100 5.000 13 0.100 0.200 0.100 3.000 From the foregoing experiments it was deducible, — 1st. That the action upon lead was most energetic during the first few days of exposure. 2d. That the differences between the action on one, two, and three bars, the volume of water remaining the same, being inconsiderable, the action could not be dependent upon the surface of lead exposed, but upon some other constant condition. The observation, that, where the bar touched the containing tube, the action seemed most vigorous, suggested an explanation of the want of uniformity in results. It further suggested experiments with suspended bars, the results of which are detailed in the following table. Table V. Experiments with Bars suspended out of Contact with the containing Vessel. Waters not exposed to sunlight. Average results of four series of experiments. One bar to each tube. No concentration. Days. Cochituate. Croton. Fairmount. Jamaica. 1 2 3 4 15.500 0.012 0.012 0.000 1.500 0.012 0.001 0.000 0.280 0.012 0.000 0.000 80.000 2.750 0.027 0.000 These experiments and the foregoing seemed to show that, without contact of the solid metal with the containing vessel, the influence of