London's Pulse: Medical Officer of Health reports 1848-1972
View report page
Hints from the Health Department. Leaflet from the archive of the Society of Medical Officers of Health. Credit: Wellcome Collection, London
Twickenham 1955
[Report of the Medical Officer of Health for Twickenham]
This page requires JavaScript
H
>
td
r
M
GO
Results of the Chemical and Bacteriological Examination of the Water Supply to the Borough of Twickenha
for 1955.
Parts per million (unless otherwise stated).
| Description of the Sample | Number of Samples | Ammoniacal Nitrogen | Albuminoid Nitrogen | Oxidised Nitrogen (Nitrate) | Chlorides as C1 | Oxygen abs. from Permanganate 4 hrs. at 27‹c. | Turbidity, in terms of Silica | Colour, m.m. brown, 2 ft. tube, Burgess's Tintometer | Hardness (total) | ¡ Hardness (Non- carb.) | pH. Value | Phosphate as P.O. 111/4 | Silica as SiO2 | Conductivity | Sulphates as SO4 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| River Thames water filtered at Hampton Works | 232 | 0.011 | 0.083 | 3.9 | 26.0 | 1.05 | 0.3 | 13 | 261 | 67 | 7.8 | 0.50 | 10 | 450 | 49 |
| Description of the Sample | Number oj Samples | Plate count (average per millilitre) Colonies counted on agar after 20-24 hrs. at 37‹C. | Bad. coli test | |
|---|---|---|---|---|
| Percentage of samples negative in 100 ml. | Average number of Bact. coli per 100 ml. | |||
| River Thames water filtered at Hampton Works | 913 | 4.8 | 100.0 | NIL |