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8
It is, however, more interesting to observe what increase in illuminating
power has been obtained by the New Act, which nominally raises the
standard two candles. I find that the real increase of illuminating power
is one-fifth of a candle.
Ammonia was, of course, one of the impurities rarely absent; but its
amount was never excessive. Sulphuretted hydrogen was never detected.
Sulphur in all forms averaged 19.8 grains per 100 cubic feet, varying from
10.52 to 28.58 grains. The old Act prescribed 20 grains per 100 cubic feet
as a permissible maximum; but no maximum is fixed by the New Act.
(Signed) THOMAS STEVENSON,
Medical Officer of Health.
July, 1871.