London's Pulse: Medical Officer of Health reports 1848-1972

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Hints from the Health Department. Leaflet from the archive of the Society of Medical Officers of Health. Credit: Wellcome Collection, London

Twickenham 1950

[Report of the Medical Officer of Health for Twickenham]

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Table: TABLE 9.Results of the chemical and bacteriological examination of the water supply to the borough of twickenhamfor 1950.Parts per million (unless otherwise stated).(a) Chemical.

TABLE 9.

Results of the chemical and bacteriological examination of the water supply to the borough of twickenham

for 1950.

Parts per million (unless otherwise stated).

(a) Chemical.

Description of the SampleNumber of SamplesAmmoniacal NitrogenAIbuminoid NitrogenOxidised Nitrogen (Nitrate)Chlorides as clOxygen abs. from Permanganate 3 hrs. at 80° F.Turbidity, in terms of SilicaColour, m.m. brown, 2 ft. tube, Burgess's TintometerHardness (total)Hardness (permanent)pH. ValuePhosphate as P.O.Silica as SiO2Conductivity
River Thames water filtered at Hampton Works2440.0160.0914.125.81.180.416274837.90.4111.0475
(b) Bacteriological.
Description of the SampleNumber of SamplesPlate count (average per millilitre) Colonies counted on agar after 20-24 hrs. at 37°c.Bact. coli test
Percentage of samples negative in 100 ml.Average number of Bact. coli per 100 ml.
River Thames water filtered at Hampton Works8176.999.90.002