4 
122 Morey on Heat and Light. 
bustion still continues, is certain, from the explosive deto- 
nating noise or report, continuing to be distinctly heard. 
Orford, May 4th, 1819. 
Arr. XID. On Heat and Light; by Mr. Samven Morey. 
[Second Communication.] 
TO PROFESSOR SILLIMAN. 
Sir, 
AS the use of a certain proportion of water for affording 
heat and light, has become more familiar, and some of the 
experiments being very simple, and such as may be easily 
repeated, I have thought I might be justified in submitting 
to your perusal some further remarks and experiments on 
ihat subject; hoping you may there from select something 
which may find rine in the American Journal. 
I find, that, for common use, the most convenient mode is 
to evaporate the substance designed to afford light, or light 
and heat, provided it naturally contains a sufficiency of water 
a vapor burn with a white flame free from ae ; 
we observe mineral coal when the fire first reaches it, 
we shall perceive, that the vapor which first issues, burns 
with a hat flame, free from smoke; owing atte stent 
to the great Mahe of water. So also it is with pitch- 
pine raat or the fat knots, if the heat be not too great. It 
is curious to seat the effect in burning pw Sea of pi 
wood, which contains more or less of the Mie 
streams of vapor are often pushed out to a r SoLASeeae dis- 
tance, and burn with a very pleasant white flame. These 
knots burn for a long time, and will sometimes retain water 
enough to burn the vapor without Smoke, until the whole of 
Ty 
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