[Report 1947] / Medical Officer of Health, Middlesbrough County Borough.

  • Middlesbrough (England). County Borough Council.
Date:
1947
Catalogue details

Licence: Attribution 4.0 International (CC BY 4.0)

Credit: [Report 1947] / Medical Officer of Health, Middlesbrough County Borough. Source: Wellcome Collection.

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    Chemical Results expressed in parts per 100,000. Bacteriological Results. Bacteria on Agar at 37°C. per ml. 1 day . . 7 42 0 Bacteria on Agar at 37°C. per ml. 2 days . . 11 55 2 Bacteria on Agar at 20 °C. per ml. 3 days . . 60 800 1 Presumptive B.Coli per 100 ml. Nil. 1* Nil. Cl. Welchii Reaction, 100 ml. Present Present Absent Cl. Welchii Reaction, 10 ml. . . * Present on one occasion Absent only. Absent Absent LARTINGTON GRAVITATION SUPPLY. Summary of Results—1947. Appearance — Clear and Bright Taste and Odour — Nil. Average Maximum Minimum pH . 7.0 7.1 6.9 Colour (Hazen) 62 85 45 Chlorine in Chlorides . . 6 8 4 Total Hardness 48 55 35 Temporary Hardness . . 37 45 25 Permanent Hardness 11 25 5 Total Alkalinity 37 45 25 Free Carbon Dioxide . . 6 8 4 Total Solids, dried at 180°C. . . 84 100 70 Nitrogen in Nitrates . . 0.2 0.8 0.0 Nitrogen in Nitrites 0.01 0.01 0.00 Free Ammonia 0.053 0.150 0.000 Albuminoid Ammonia 0.059 0.096 0.036 Oxygen Absorbed in 3 hrs. at 37 °C. 5.53 7.50 3.60 Iron . 0.13 0.23 0.05