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140
gross calories and 121.7 net calories in December, 191 r, and ar
minimum, monthly average of I33.1 gross and 120.1 net calories in
February, 1912.
The weekly averages indicated by the curve in Table III. show
that the extreme variation during this same period was not excessive,
the minimum being 132 gross calories (November and December,
1911, and February, 1912), and the maximum 141.0 gross calories
(March, 1912).
The question has, I am aware, been frequently asked as to what
is the relation between the illuminating power and the calorific
power. So far as general experience goes, at present there does
not appear to be any definite relation such as would enable an
observer to calculate the one from the other. There are many
obvious reasons for this absence of definite relationship. On the
other hand, experience has also shown that, as a rule,high illuminating
power corresponds to a high calorific power, and this somewhat
general deduction is more or less demonstrated on comparing the
curves shown in Table III.
I have also shown, in Table I., the monthly averages of sulphur
Sulphur.
(grains in lou cuuic ieet; ior uie year enueu jisi
March, 1912. It will be observed that the total
average is 22.6 grains, with a minimum monthly average of 15.5
grains (January, 1912), and a maximum of 27.9 grains (May, 1911).
In Table III. the curve of weekly averages is shown, and here
the minimum is 12 grains, in February, 1912, and the maximum
nearly 33 grains, in April, 1911. Thus, while the general average
is low, there have been from time to time considerable fluctuations.
This impurity has at no time been found to be present during
Sulphuretted
Hydrogen.
this year.
Observations of the pressure have been made at the times of
Pressure.
making all other usual tests, ine general average
pressure for the year ended 31st March, 1912, is
3.4 inches, with a maximum of 3.0 and a minimum of 2.1 inches.