Comparison of the Blowpipe of Hare and Brook. 91 
’ Especially, would this danger be serious, were such vol- 
umes of the gases employed as to keep up a train of experi- 
ments for hours, without recruiting the gases. This is the 
case in the large pneumatic cistern in the Laboratory of 
Yale College. The recipients for gas, in this, amount col- 
lectively to the capacity of fifty gallons; they are all con- 
nected at pleasure; the gas in them, when they are full, 
as a pressure of fifteen inches of water, and the consump- 
tion of half a cubic foot of gas reduces the pressure only 
one inch, and so in proportion. 
his instrument, or one on similar principles, has been in 
use, inour hands, for the 2 id e ike aha blow- 
A seventeen or eighteen ears 5 and n 
pipes por ae pects the well oft the 
between the two hostile gases. 
~The seale of the instrument bay enabled us to indalye, 
even to luxury, in the numerous and splendid experiments 
of fusions and combustioms, which were performed on most 
— Js 
ses, as well as in private researches, for years before the 
iit eee were ever heard af- 
5 “ te tae - 3 
Application Hare’s — one : w te ee mation 
‘The synthetical ‘ithadibes of water, from the combustion 
of the oxigen and hydrogen gases, is of course an interest- 
ing ec eM to all i nay on a courie of —— 
‘London, exhibits the fact pect ae neti the pro 
and not without some 
cs 
practical difficulties i in nthe use. 
was seuiee gle ments oft the tin eninge were shot 
among the * st gman nee of twenty feet all around ; several 
persons inte —* ialeed, Sod fie eaaes, nn d the right tem 
ided, 0 produce a copious. rrhag¢ 
dent will jastify the remarks in the text. —~ 
