Description of Mr. Perkins’ New Steam-Engine. lt 
ter, and alcohol introduced into the innermost cylinder, it 
soon boils and escapes by the pipes. These pass through 
stuffing boxes in the bottom of the cylinder. Hence their 
orifices, and of course the flame, may be made to approach 
hearer to, or recede further from, the boiler. 
The construction of this instrament, which I call the 
compound blowpipe by alcohol, may be Sigtecce from 
the engraving (Plate — Fig. 4 ) 
The idea of making the flame of bydtagdos gas, Be 2 
holic vapour, more luminous, by an admixture of oil of tur- 
pentine, occurred to me in 1819; and I put the idea into 
practice, in the summer or succeeding winter of that year, 
when my pupils witnessed the result. 
_It seems, that Mr. Morey, by another catenation of ideas, 
was led to a similar inference, employing, in an alcohol 
blowpipe, whiskey and turpentine. hie endeavours so 
to Gneeuniaie the efflux of a single jet-of the vapour of 
these fluids, as that it may continue gn burn, when anne 
ted 
This process is too troublesome and precarious, ‘baat 
dinary use. A mixture of alcohol and turpentine, are 
burned with a wick ina lamp, in the same way as oil, 
according to my plan. It is of course perfectly practica- 
ble, and I shall be surprised if it be not aoa in the 
Western country, where alcohol may be had very cheap, 
and oil must be comparatively dear. asd sit Yo 
eek 
Art. XV — Description of Mr. Perkins? New Steen Bl 
and of the application of his Invention to Engines of the Old 
Construction. (Edinb. Philos. Joarnal; No. xvii; P- aia) 
We have already communicated to our readers:in the 
two last Numbers of this Journal, all the authentic informa- 
tion which we could obtain respecting Mr. Perkins’ new 
py ihe 3; and we have used the inva, 
hate been so long considered as the greatest triumph of art 
and science, that it was deemed a sort of heresy to regard it 
