280 Description of a Hydro-pneamatie Blow-pipe. 
ether. I have met with alechol which produced | 1-16th more: 
than any other. Does this arise from the heterogeneous princi- 
ples which they contain more or less, or from the varied pro 
portions of elementary substances of which they are composed, 
or lastly from a still stronger portion of aroma ? 
Without attempting to account for these varieties at present, 
I shall merely say that the alcohols which seem to give most 
ether are: Ist, that produced from perry ; 2d, wine; 3d, cider, 
The spirits denominated cherry brandy, rum, geneva, and whisky, 
are far inferior to those just enumerated in respect of the quan- 
tity of ether which they yield. 
LIX. Description of a Hydro-pneumatic Blow-pipe for the Use 
of Chemists, Enamellers, Assayers, and Glass-blowers. By 
Mr. Joun Titrey, of Whitechapel*. 
Sir, — Bate a travelling fancy glass-blower, I work with a 
machine which I have contrived for my own use, and which I 
have been advised, by a great number of respectable gentlemen, 
to lay before the Society of Arts,&c. ‘The invention consists of a 
tin-box, with a partition in it reaching from the top at one end 
to within an inch of the bottom. The vessel is air-tight at this 
end. It is three parts filled with water. By means of a tube 
reaching within half an inch of the bottom, I blow into the water 
at the air-tight end; the air rises in bubbles through the water 
to the top, and forces the water under the partition into the 
other compartment. The weight of the water acts upon the air 
which had been blown in, and forces it through a blow-pipe di- 
rected to the lamp, and keeps up a continued blast till the air is 
exhausted. More air may be blown in from time to time, so as 
to keep the blast regular and continual. It is thus I execute my 
fancy glass-blowing. The whole apparatus, including lamp and 
case, weighs only three pounds and a half. 
I believe I am the first glass-blower who ever worked with such 
a machine. 
If the Society should think me deserying of any reward, it will 
be very thankfully received by, 
Your obedient humble servant, 
Joun TILLey, 
Direct for me at Mr. Thomas Yandall’s, bookseller, Old Street 
Road, near Shoreditch Church. 
* From Transactions of the Society for the Encouragement of Arts, Sc. 
for 1813.—Fifteen guineas were vated by the Society for this communica- 
tion, and one of the machines is preserved for public inspection in the 
Society’s Repository, 
? The 
