The portion of the flame which is supposed to be the hottest is about
half an inch above the tip of the inner zone of the flame, and it is
at this point that most vessels containing water to be heated are made
to impinge on the flame; and it is this portion of the flame, also,
which is utilized for raising various solids to a temperature at which
they radiate heat.
In order to gain an insight into the amount of contamination which the
air undergoes when a geyser or cooking stove is at work, I have
determined the composition of the products of combustion, and the
unburned gases escaping when a vessel containing water at the ordinary
temperatures is heated up to the boiling point by a gas flame, the
vessel being placed, in the first case, half an inch above the inner
cone of the flame, and in the second, at the extreme outer tip of the
flame.
GASES ESCAPING DURING CHECKED COMBUSTION.
| Bunsen flame. | Luminous flame.
+-----------+-----------+-------------+----------
| Inner. | Outer. | Inner. | Outer.
+-----------+-----------+-------------+----------
Nitrogen | 75.75 | 79.17 | 77.52 | 69.41
Water vapor | 13.47 | 14.29 | 11.80 | 19.24
Carbon dioxide | 2.99 | 5.13 | 4.93 | 8.38
Carbon monoxide | 3.69 | Nil.
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