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The apparatus for this purpose consists of:-
(a) A standard deposit gauge standing on the roof of the link
block of the Town Hall. The container is removed monthly
and the contents, which are too coarse to be held in suspension
in the atmosphere, are analysed at the Trinity Grammar
School Laboratory.
(b) A combined smoke and sulpher dioxide recorder, in a second
floor room at the Town Hall. The daily assessment of smoke
and sulpher dioxide is carried out by the Public Health
Inspectors.
In view of the short time these measurements have taken
place, it is not possible to comment on the trend or the degree
of air pollution in the Borough.
The reports are sent to the Department of Scientific and
Industrial Research at present carrying out a national survey of
air pollution.
Mr. James attended the International Clean Air Conference at
Seymour Hall in London, W. 1., during October. He submitted a full
and concise report on this Conference to the Health Committee in
November.
Mr. Goodfellow was successful in obtaining the Certificate
of the Royal Society of Health for Smoke Inspectors.
Rodent Control
During the year, 159 dwellinghouses in the Borough were
treated for rat infestation: this entailed 1,361 visits. In
addition 20 other premises were treated for the presence of rats,
entailing 95 visits. A further 55 dwellinghouses and 8 other
premises required treatment for mice and a total of 469 visits
were made in dealing with these.
The Council s tip at White Hart Lane was constantly baited
with Warfarin throughout the year. Where there is suspicion or
evidence that the rats are coming from defective drains or public
sewers the Public Health Inspector is informed, a test with the
smoke testing machine applied, and any necessary action taken.
During the year the sewers were treated on two occasions for
the control of rats. For this purpose the Borough is divided
into ten areas, each of which has approximately 70 manholes. The
treatment is carried out by two gangs of two men each and the time
occupied is just over three weeks. In this connection co-operation
is sought from the Borough Engineer and Surveyor's Department.
Each of the manholes is baited on two occasions with unpoisoned
bait, and on the third occasion poison is added to the bait.
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