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85
of fires and a secondary peak in the early evening, which corresponds
with the making up of fires in restaurants, hotels, and also private
houses.
(3) Estimation of sulphur gas (as sulphur dioxide). The method
employed is that of bubbling a measured volume of air through a solution
which has an affinity for sulphur. The sulphurous impurities are there
washed out of the air and can be measured by chemical analysis.
Chart "B" indicates graphically the amount of sulphur gas correlated
with visibility, wind direction and rainfall during 1934. The code used
for the "visibility" curve is that issued by the Meteorological Office and
is as follows:—
0. Dense fog Objects not visible at 55 yards.
1. Thick fog ,, ,, 220 „
2. Fog „ „ 550 „
3. Moderate fog ,, „ 1,100 „
4. Mist or haze „ „ 1 1/4 miles.
5. Poor visibility „ ,, 2½ „
6. Moderate visibility „ „ 6 1/4 „
7. Good visibility „ ,, 12½ ,,
8. Very good visibility ,, „ 31 ,,
9. Excellent visibility Beyond 31 miles.
It is interesting to note that the amount of pollution follows the
general "line" of the visibility. The periods of observations are those
of 24 hours in each week, and are generally made between 10 a.m.
Thursday and 10 a.m. Friday.
HOUSING.
The special housing survey initiated in the late autumn of 1933 and
referred to in the report for that year, proceeded more intensively during
1934, and will be completed by the end of June or July 1935. The objects
were to report within a reasonably limited period any areas which might be
included for clearance; to discover the nature and extent of basement
dwelling; to assess the prevalence of overcrowding and to note and to
provide remedy for sanitary defects found in dwelling houses during the
course of the house to house inspection of the survey.
To enable the survey to be adequately undertaken and completed
within the period indicated the Council appointed in all 5 temporary
sanitary inspectors and 7 temporary clerks. The full complement of
staff engaged on the survey was at work from July, 1934.
(9169) G