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69
this method it is possible to compare the intensity of pollution of the air by
sulphur at different places and times.
Samples from the Council's two stations are sent to the Council's Public
Analyst at monthly intervals and the results of the analyses are reoorted to
the Public Health Committee and also sent to the Director of Fuel Research, the
Department of Scientific and Industrial Research, Fuel Research Station, East
Greenwich. That Department publishes a monthly "Bulletin" in which are
reported the results of analyses from all stations throughout the country. A
table of monthly findings from the Atmospheric Recording Stations in Hackney is
given on Page 14 of the Aopendix.
(b) Smoke, and Sulphur dioxide (by the volumetric method). Measurements
of these constituents are made at the following three stations:-
Station Apparatus installed Maintained by:
Hillman Street Volumetric sulphur dioxide )
Stores instrument with filter ) Hackney Borough
attachment ) Council
Lampard Grove Depot do, Hackney Borough
Council
Ambulance Station, do. London County
Brooksby's Walk Council
The Volumetric Sulphur Dioxide Instrument consists of an electrically
operated air pump which draws a measured quantity of air through a test tube
containing a solution of hydrogen peroxide which retains the sulphur in a form
suitable for determination by titration with alkali. The sulphur dioxide
combines with the hydrogen peroxide to form sulphuric acid (H2 O2 + SO2 = h2 SO4).
The amount of alkali needed to neutralise the sulphuric acid is measured and
the average concentration of sulphur dioxide during the period under test is
then calculated by reference to a formula. Measurement of the concentration
of smoke in the atmosphere is made by inserting a filter paper between the air
intake and the test tube. Air passing through the filter paper produces a
stain the shade of which is dependent upon the amount of smoke in the
atmosphere. Once a day, or at such other intervals as may be appropriate, the
filter paper is changed and the "shade value" of the stain assessed by comparing
it visually with a set of standards, The smoke concentration is
calculated from the shade value and the quantity of air passed.
The readings and the necessary calculations are made daily, excluding
Sundays. These also are sent to the Department of Scientific and Industrial
Fuel Research and reported in the "Bulletin",
A table setting out the monthly average and highest daily average for each
month of the concentration of smoke and sulphur dioxide is given on Dage 15 of
the Appendix.
PUBLIC HEALTH (LONDON) ACT, 1936 - SECTION 147 (1) (Nuisances arising
from offensive trades). Eight complaints relating to effluvia from trade
premises were received, and three informal notices, two of which were followed
by a formal notice, were served. All three nuisances were abated without
recourse to legal proceedings. The total number of investigations made in
connection with offensive trades was 159,