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43
for the November sulphur figure for Acacia Road, when the louvred
box and padlock were smashed, and the prepared candle stolen,
probably by children. This instrument has been moved to a less
obvious position on the same site.
ESTIMATION OF ATMOSPHERIC SULPHUR BY THE
LEAD PEROXIDE METHOD
The monthly figures for each station for the years 1954 and
1955 are shown on page 44 and the 1955 figures are illustrated
graphically on page 46.
The station with the highest monthly figure was Canham
Road—7.7—and that with the highest average figure was Bashley
Road—8.71. The station with the lowest monthly figure was Canham
Road—1.37—and that with the lowest average figure was Acacia
Road—2.65.
The average of all stations for the year was 3.11 which is a
considerable increase over the previous year's result. Over the five
years during which readings have been made, until this year, the
average amount has risen each time although the size of the increase
has been less each year. This point is illustrated graphically
by the two diagrams on page 45. It may be of interest to note that
this year is the first full year that the new power station in North
Acton Road has been in operation.
DEPOSIT GAUGES
The monthly figures for each station are shown statistically on
page 47 and graphically on page 46.
The yearly average figure—24.63 tons/sq. mile—has increased
by 8% over that of the previous year although the amount of
combustible material in the deposit has increased by only a very
small amount.
Once again the station with the greatest monthly deposit—
43.38 tons/sq. mile—and the greatest average deposit—30.16
tons/sq. mile—was Bashley Road. The Town Hall gauge showed
the lowest monthly deposit of 13.65 tons/sq. mile and the lowest
average deposit of 21.48 tons/sq. mile.
The increase in the average deposit for the year is the highest
in the four complete years during which the gauges have been in
operation.