Morey on the Patent Water-Burner. 143 
use, the common tin plate answers well for making nearly 
the whole of the lamps. A conical form is the most con- 
venient. When used, it may be placed on a stove overa 
cylinder of charcoal, or in any situation where the heat will 
be sufficient to keep up a gentle distillation. The vapor 
then may issue above. If intended to support its own evap- 
oration, the vapor will issue from a tube, projecting from one 
to two inches below the bottom, and about one back of the 
front side, opening forward, so that if it inclines to boil too 
fast, the flame will be pushed out so as to lose its heating ef- 
fect in some measure, on the bottom, by which means it 
will perfectly regulate itself. To insure a regular issue of 
the vapor, we pass it one or more inches through a tube, one 
fiftieth or one sixtieth of an inch bore, and which we also 
fill with very fine wire, if a light is wanted not greater than 
three or four candles. ‘These tubes, when thus filled, ap- 
the temperature of water in a tumbler is raised to a little 
above 200°, having a sinall ball of charcoal sus nded in 
it, there is no appearance of boiling; butif a small quantity 
of spirits turpentine is added to the water, the ll of coal 
will in a few seconds commence, and continue sending up a 
Column of steam, nearly of its own bulk, while the bottom 
of the vessel where the heat is applied, and balls of wood 
and of metal suspended on each side of the ball of coal, fur- 
nish none. Why is it so? The water’s temperature 1s not 
high enough to form steam until it comes im contact with : 
