164 Prof. Green’s Blow-Pipe. 
dice. I have never seen any bad effects from the use of 
the phosphoric acid, although it is said that phosphorus is 
This I have never use 
I shall be happy to answer any inquiries, and remain res- 
pectfully your obedient servant, 
CALEB MILLER. 
Art. XVII.— new Blow-Pipe, by Prof. Jacop Green 
of Nassau-Hall, Princeton. 
[Received in May, 1821.] 
Tere is scarcely an instrument in the laboratory, which 
has undergone so many varieties in construction, as the 
blow-pipe—both the chemist and the artisan are in posses- 
sion of a number; but the great inconvenience I experi- 
enced in using the common mouth blow-pipe, (which is 
robably the best p: occasioned the contrivance 
T shall wesently di ‘The power of ceamet, up acon- 
stant sti stream of air with this i instrument, and which is so es- 
is with difficulty acquired, and is always fatiguing, 
if not injurious when continued for a length of time. In those 
experiments which require the free use of both hands, this 
cannot be employed, and the enameller’s blow-pipe which is 
then resorted to, is cumbersome and expensive ; to obviate 
these difficulties, to make a blow-pipe cheap and portable, 
and which may be applied with facility to purposes that re- 
quire both hands to be left at liberty, has been my design in 
this communication, and in completing it there will be found 
but little novelty either in the 1 lide on which it acts, or 
in the mode of its constructio 
Figure 1, represents the cauicumen made of copper, or 
tinned iron covered with a thick coat of paint to prevent 
rust or oxidation. It consists of two principal parts—A. 
A. is a large cylindrical vessel for the purpose of containing 
the water by which a portion of atmospheric air is confined 
ut to diminish the weight which a large quantity of water 
weaald occasion a smaller vessel, B. B. close at the top © 
the same shape as the exterior cylinder is soldered to. the 
bottomof A.A. C. C. is another cylindrical vessel design 
