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35
hydrogen peroxide and the concentration of sulphur dioxide in
the atmosphere can be determined by measuring the degree of
acidity assumed by the solution. Once a day 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 readily calculated from the shade value and
the quantity of air passed.
Both daily and monthly recordings are tabulated and
submitted to the Fuel Research Station.
SMOKE ABATEMENT. OBSERVATIONS AND INSPECTIONS
Thirty-one complaints were received from residents
relating to nuisances from smoke and chimneys.
In the case of one large concern the trouble was of
old standing (due to war damage), but it appears to have been
cured by the reconstruction of the boiler house and the
installation of new boilers.
I was asked to make a special report to the Public
Health Committee on the question of the emission of smoke, steam
and grit from various of the railway tunnel ventilating shafts in
the Borough, some of which terminate in most unsuitable positions.
In one case the shaft which is 15' 0" wide and 50' 0" deep covers
the whole of the back garden and extends to the first floor
window level of premises in Belsize Crescent.
Houses within 150 feet of the shafts were visited.
Some residents complained bitterly of the sulphur, soot, grit,
smoke and steam which emanated from the shafts and caused damage
to the fabric of the building, rotting of curtains and general
acute discomfort to the occupier. Others seemed to accept the
position and made no complaint. Your Inspectors spent a
considerable amount of time in making observations and some
220 visits were paid.
Frequent representations were made to the British
Transport Commission regarding these emissions. The Commission
replied that "it Is not possible entirely to eliminate the
emission of smoke from locomotives whilst passing through the
tunnels but steps are being taken to reduce it to a minimum".
The position is unsatisfactory and until the programme
of electrification of the railways has been completed, I do not
think we can hope for any appreciable improvement.