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74
July 5th, 1895.
To the Chairman and Members of the Building and Drainage
Committee.
Gentlemen,
We your Surveyor and Medical Officer of the South District
beg to further report respecting the utility of the " Fresh Air Inlet."
On the 1st of July, together with Messrs. Riddall, Thurston, Gibbon,
Puddefoot and T. McCarthy, forming a Sub-Committee, we inspected
a number of " Fresh Air Inlets," in the district, and in all instances
they were found to be working. At 126, St. Leonards Road, (the
premises mentioned in our report of the 19th of June,) the air meter
was so fixed in the air intake pipe of the drain that the figures on the
dial could be easily read. It was found in 15 minutes air was drawn
into the drain with a velocity of 700 lineal feet, this figure does not
take into consideration the correction which for the instrument used
is "30 per minute to the observed reading of the air meter," and in
this instance would be 450 added to 700 making a total velocity of
1,150 lineal feet in 15 minutes. We also beg to report that the
Anemometer was placed for 92 hours in the air intake pipe at 16,
High Street, Poplar, and the instrument registered that air had passed
in with a velocity of 29,516 lineal feet. The meter was replaced for
7 hours and a further velocity of 5,295 lineal feet was given.
We are, Gentlemen,
Your obedient servants,
(Signed) G. F. HOLT, Surveyor.
FREDK. WM. ALEXANDER,
Medical Officer of Health, South District.
P.S.—The correction is not taken into consideration in the last
two instances.