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134
Appendix "B."
General Report on Testings of Gas supplied to the Wandsworth
Borough Council (1) by the Wandsworth and
Putney Gas Company; (2) by the Mitcham and Wimbledon
Gas Company for the year ended 31ST March, 1910.
Wandsworth and Putney Gas Company.
The mode of testing- the gas has been the same as since 1st
July, 1907, that is in accordance with instructions
which I received from the Wandsworth Borough
Council to test the gas twice weekly instead of daily, with such
extra tests as might seem desirable or necessary.
The monthly averages of illuminating power and sulphur
given in Table I., and the curves in Table III. of this report, indicating
the fluctuations throughout the year ended 31st March,
1910, are, therefore, based on the results of bi- or tri-weekly
testings of the gas.
Illuminating Power.
By inspection of Table I. it will be seen that the average
illuminating power of the gas for the whole year
was 14.8 candles the statutory limit being 14.0
candles. Previous yearly averages have been 1903-1906, 15*4;
1907, 14.7; 1908 and 1909, 14.9 candles.
During the year ended 31st March, 1910, the monthly
averages have varied between a maximum of 15.2 candles (May,
1909) and a minimum of 14.5 candles (January, 1910)—see Table I.,
while the weekly averages have varied between a maximum of
15.6 candles (May, 1909) and minima of 14.3 candles (December,
1909, January and March, 1910)—see Table III.
In no instance have I found the illuminating power below the
statutory limit during the year.
Sulphur
The average number of grains of sulphur in 100 cubic feet of
gas was 24.0 for the whole year, there being no
statutory limit in connection with this impurity
since the passing of the Removal of Sulphur Restrictions Act, July
20th, 1906. Up to that date, and calculating from monthly