A short table of degrees of heat in
various forms of fuel is given below; the degree required for baking, &c,
finding place when we come to general operations in cooking.
DEGREES OF HEAT FROM FUEL.
Willow charcoal 600 deg. _Fah._
Ordinary charcoal 700 deg. _Fah._
Hard wood 800 deg. to 900 deg. _Fah._
Coal 1000 deg. _Fah._
_Lights_ are next in order. Gas hardly requires mention, as the care of it
is limited to seeing that it is not turned too high, the flame in such
case not only vitiating the air of the room with double speed, but leaving
a film of smoke upon every thing in it. Kerosene is the oil most largely
used for lamps; and the light from either a student-lamp, or the lamp to
which a "student-burner" has been applied, is the purest and steadiest now
in use. A few simple rules for the care of lamps will prevent, not only
danger of explosion, but much breakage of chimneys, smoking, &c.
1. Let the wick always touch the bottom of the lamp, and see that the top
is trimmed square and even across, with a pair of scissors kept for the
purpose.
2. Remember that a lamp, if burned with only a little oil in it, generates
a gas which is liable at any moment to explode.
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