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July, 1889) with a view to(l) providing a trustworthy standard
of light, (2) prescribing a standard photometer with which all
official photometers should be compared, and (3) giving legal
force to tests made with a portable photometer; the reasons
for which are fully set out in the Committee's communication.
No action appears to have been taken in the matter at present
by the Board of Trade.
2. As regards Purity. The gas was free from sulphuretted
hydrogen throughout the year; and the quarterly
average quantity of other sulphur compounds present in the
gas, was considerably less than the quantity permitted, the
maximum, moreover, not having been attained on any occasion.
But, as will be seen in the following table, the maximum, the
minimum, and the average amounts actually found in 1889,
considerably exceeded the proportions in 1888:—

Ammonia, a valuable residual product of gas manufacture,
was present in the gas more or less frequently throughout the
year, but only in slight quantities. On no occasion was the limit
fixed by the Acts of Parliaments—viz., four grains in 100 feet
of gas—exceeded.
The Chief Gas Examiner being independent of the
Company, it is satisfactory to note that his reports on the daily
testing of the gas are so favourable.