’ Description of a Hydro-pneumatic Blow-pipe.  28¥ 
The apparatus is applicable to the business of enamellers,’ 
jewellers, chemists, and many other arts, and can be furnished 
complete for 2/. 12s, 6d. made of tinned copper. 
March 27, 1812. 
To C. Taylor, M.D. Sec. 
Reference to ihe Engraving of Mr. Titury’s Hydro-pneumatic 
Blow-pipe.—Plate IV... ‘Fig. 4, 55.6, /5.5- 
The utility of the blow-pipe, in the arts, to raise a great heat 
in a small object, from the fiame of a lamp, is too well known to 
require pointing out. The assay of minerals, the arts of enamel- 
ling, jewellery, soldering metal works, but above all the blowing 
of small articles in glass, are purposes to which it is better 
adapted than almost any,othér mode of applying heat. The 
usual manner of producing a stream of air for blowing glass, is 
by means of a small pair of double-acting bellows, fixed beneath 
a table, and werked by the operator’s foot; a pipe proceeds from 
these bellows to the top of the table, and terminates in a small 
jet, before which a lamp is placed, and the flame blown by the 
current of air upon the object to be heated. The defects of the 
bellows are, that the stream of air is not perfectly regular, which 
causes a wavering of the flame, so that it does not fall steadily 
upon the object which is to be heated. Mr. Tilley’s blow-pipe 
corrects these defects, by using the pressure of a column of water 
to regulate the stream of air, and the supply is furnished from 
the mouth of the operator, by blowing through a tube, fig. 4, C, 
at a section of this instrument, and: fig. 5 shows a perspective 
view of it in action, AA is a vessel of tinned iron, or copper, 
about seventeen inches high, five wide, and nine broad ; the lid 
of which opens and shuts on hinges, and supports the lamp B, 
which burns tallow instead of oil. C is the blowing-pipe, by 
which the air is thrown into the vessel: this, as shown in the 
section fig. 4, has an inclined partition D, which divides it into 
two chambers, E and F; -but as the partition does not reach 
to the bottom of the vessel, the two compartments com- 
municate with each other underneath it: that marked F is 
closed at the top so as to be air-tight ; but the other is only co- 
vered by the lid of the vessel, ‘and may therefore be considered as 
being open to the outward air. The pipe C, fig. 4, is soldered 
air-tight, where it passes through the top of the chamber, and 
descends very near to the bottom of the vessel, deeper than the 
partition D does, so that its mouth is always immersed beneath 
the water. The metallic part of the blow-pipe G, which, con- 
veys the blast of air to the flame of the lamp, is likewise soldered 
into the top of the chamber F; it holds a bent glass tube, a, 
which 
