164 Prof. Green’s Blow-Pipc. 
dice. I have never seen any bad effects from the use of 
the phosphoric acid, although it is said that phosphorus is 
poisonous. This [have never used. 
I shall be happy to answer any inquiries, and remain res- 
pectfully your obedient servant, 
CALEB MILLER. 
Art. XVII.—.14 new Blow-Pipe, by Prof. Jacon Green 
of Nassau-Hall, Princeton. 
[Received in May, 1821.] 
Ture 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 
probably the best portable one) occasioned the contrivance 
{ shall presently describe. The power of keeping up acon- 
stant stream of air with this instrument, and which is so es- 
sential, is with difficulty acquired, and is always fatiguing, 
if not injurious when continued fora 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 principle on which it acts, or 
in the mode ofits construction, 
Figure 1, represents the instrument 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. 
A. is alarge cylindrical vessel for the purpose of containing 
the water by which a portion of atmospherte air is confined 
but to diminish the weight which a large quantity of water 
would occasion a smaller vessel, B. B. close at the top of 
the same shape as the exterior cylinder is soldered to the 
bottom of A. A.C. C. is another cylindrical vessel design- 
