126 Morey on Heat and Light. 
and furnishes a constant and almost perfectly regular sup- 
ply; so much so, that while evaporating the pitch pine or 
other pilihenite for the light, it is barely possible some- 
times to perceive any variation for 
The cylinder "for holding the pitch pine or other rahe 
stance, is placed within or surrounds this. I find the best 
mode of letting out the vapor, is from a circular tube, on 
the principle of Argand’s lamp; sometimes, when much 
light is required, from a cluster of them ; and to furnish 
them with fresh, and very hot air, bya tube pesos down 
and through the ignited coal and grate. This very hot air 
tends much to preserve the temperature of the vapor until 
inflamed ; and to increase the bulk of the flame, as well as 
its intensity. This tube requires a register also. And this 
kind of lamp, or lamp- {ea admits of a glass burner or flue, 
as conveniently as any ot 
It will easily be seen, tat thin sheet-iron on this plan, 
will give as regular aud as durable a heat, as brick or stone 
of any thickness. If instead of putting in ignited coals at 
the bottom, two or three inches of them are placed on the 
top, the red heat of the coal passes down through the whole 
in a few minutes, leaving the coal black above, just as fast 
as it is ignited below, until it reaches the bottom, when it 
becomes stationary. After this piasrt there is no smoke 
from. the coal, even if there was before 
’e can burn in this kind of stove or lamp, (which may 
be at the same time, for aught I see, extended to warming 
and cooking, as well as to the lighting of houses, manufac- 
tories, &c.) charcoal pare saturated with water or not; 
or the steam may be furnished by a small tin plate, or other 
, receiving its heat from the stove, and directing the 
steam to or near the bottom of the tar, &c.: tar, rosin, rough 
turpentine, or the spirit, or alcohol, or any kind of oil, fat, 
or tallow ; mineral coal, pitch-pine wood, and the knots, 
birch bark k, pumpkin, sun-flower, flax, and other seeds; 3; as 
well as many other substances : the result is, a pleasant oF 
intense white flame, free from smoke. ‘That substance 
which per has the most generally distributed over the 
earth, and which too is the cheapest known or used for 
affording pent Sing toh to be the best adapted for burning 
in these or it is equally safe, easiest managed, 
ope ote % a ches temperature, consumes a greater pro- 
