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64
authorities to assist them in collecting information with
regard to the effect of the use of intercepting traps. Finchley
being one of the districts communicated with by the Board
your Medical Officer of Health and I submitted the following
joint report upon the investigations made in this District:—
November 27th, 1907.
SPECIAL REPORT BY THE MEDICAL OFFICER OF HEALTH
AND THE SANITARY INSPECTOR ON THE USE OF
INTERCEPTING TRAPS IN FINCHLEY.
In submitting our report on the conditions found associated with
the use of intercepting traps in Finchley, we regret that the total
number of drains examined for the purpose is relatively small. Owing
to tho pressure of urgent routine work, it has not been possible to
devote much time to the special inspections necessary, but each
ease dealt with has been carefully investigated. If it is considered
desirable, we shall be glad to continue the inquiry with a view to a
supplementary report.
SUMMARY OF INSPECTIONS.
Number of traps examined 147
Number of cases in which—
(a) The intercepting trap was blocked 4
(Cause of blockage:—Two "caps" blown out into
mouth of trap; one choked with leaves; and one
choked with straw and dung.)
(b) Presence of accumulation of sewage in chambers 2
(c) Though no accumulation existed at time of inspection,
appearance of chamber showed that there had been an
accumulation 17
Cause of previous accumulations:—
7 unknown.
8 cement or concrete left in trap.
2 absence of water supply to flushing box.
(d) "Cap" of raking or cleansing arm displaced 4