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137
Illuminating
Power.
The illuminating power has varied much as usual between
14.5 and 15.5 candles, seldom being lower than
I4.5 and occasionally only somewhat higher than
15.5 candles, with a general average of 14.9 candles, for the
year ended March 31st, 1909. The statutory limit is 14.0 candles.
Table I. shows the monthly averages, and in Table III. a
curve is given showing the weekly fluctuations in the illuminating
power.
Tests with flat-flame burners have not been made, and it may
be remarked that the use of this form of burner is becoming
rapidly less as time goes on.
Sulphur.
The average amount of sulphur (other than sulphuretted
hydrogen) in the gas has considerably increased
during the year ended March 31st, 1909, being
29.5 grains in 100 cubic feet of gas, as compared with an average
of 25.6 grains for the previous year.
Table I. shows the monthly averages of this constituent of
the gas, and indicates a variation between 22 8 grains (March,
1909), and 39.7 grains (July, 1908). In Table III. a curve is
drawn which indicates the fluctuations of sulphur from week to
week. From this Table it will be seen that the highest amounts
occurred between July and October, 1908 (the average for these
four months being 35 grains) the maximum point (43.9 grains)
being reached during the week ending July 25th, 1908. During
the last five months of the year ended 31st March, 1909, however,
it decreased, the average from November, 1908, to March, 1909,
being only 25.4 grains.
Sulphuretted
Hydrogen.
There has been no sulphuretted hydrogeu found in the gas
at any testing, during the year ended March 31st,
1909.
Pressure.
From Table I., which shows the monthly averages of pressure
based on bi-weekly observations, it will be seen
that these averages have varied between 2.4 inches
(December, 1908) and 3.2 inches (July, 1908), the general average
for the whole year ended March 31st, 1909, being 2.8 inches.
I made a special Report to the Council on the subject of
pressure, in December, 1908.