110 Hare’s Compound Blowpipe by Alcohol 
rround them. In this way, the conductors are effectually 
insulated, while the principal strain is borne by the wood- 
en axes. 
~ | consider this mode of mounting an electrical plate pre- 
ferable to any with which I am acquainted. The friction 
arising from the band may render the working of the ma- 
chine a little harder for one person, with one hand; but 
then it affords the advantage, that two persons may be em- 
paren we this purpose, or one may use both hands at once. 
lhe intervention of the band, secures the plate from being 
cracked, by a hasty effort to put it into motion, when ad- 
hering to the cushions, as it does at times ; and the 
s ans of which the distance of the wheels is 
increased, obviate the liability of the band to slacken with 
wear : 
Art. XIV.—Description of an improved Blowpipe by Alco- 
hol, in which the inflammation is sustained by opposing 
jets of vapour, without a lamp: Also, of the means of ren- 
dering the flame of Alcohol competent for the purpose of 
‘Hlumination.. Mlustrated by an Engraving. By Ros- 
srt Hare, M. D. Professor of Chemistry in the Univer- 
» sity of Pennsylvania. 
In the ordinary construction of the blowpipe by alcohol, 
the inflammation is kept up, by passing a jet of alcoholic 
steam through the flame of a lamp, supported, as is usual, 
by a wick—otherwise, the inflammation of the vapour does 
not proceed with sufficient rapidity, to prevent the inflamed 
portion from being carried too far from the orifice of the 
pipe; and being so much cooled by an admixture of air, as 
to be extinguished. By using two jets of vapour in oppo- 
sition to each other, I find the inflammation may be sustain- 
ed without a lamp. If one part of oil of turpentine, with 
seven of alcohol, be used, the flame becomes very !u- 
ualize and regulate the efflux, I have con- 
Sg a gasometer. It consists of two con- 
