Account of a new inflammable Air Lamp. 331 
of wood, two inches thick, with a groove turned in its top, 
in which the jar K. L. is fitted. There is also a hole, 
through which the tube E. passes, and terminates. Fis 
a small calorimoter, which is surrounded by the jar K. L. 
From the bottom of the calorimoter, proceed the two wires 
N. QO. (which connect the poles of the instrument) through 
R.S. M. is a small blowpipe, with stop cocks, which com- 
municates by means of a glass tube, with the interior of the 
jar K. L. 5 this tube must reach a little above the calorimo- 
ter, on the inside of the jar. G.is a glass vessel, placed in 
the jar above the calorimoter, the contents of which must 
be about one third more than that part of the jar which 
contains the calorimoter. H. is a vessel of like capacity 
with G. having an open mouth I, anda glass tube G. H. 
open at both ends, passing from the bottom, through P. and 
terminating at the bottom, within the glass vessels G. It 
is scarcely necessary to add, that all the joining of this in- 
Strument must be perfectly air tight. 
. To use the instrument. 
_ Remove vessel H. and drop a few small pieces of zine 
into G, through P. ; then fill G. with a weak solution of sul- 
phuric acid and water; pour it also into the box A. B. C. 
D.; through this stop cock A. till on a level with Y. Z. ; 
then by blowing with the mouth into the box at A. the air 
above the fluid being compressed, will be forced up into the 
jar K. L. through this glass tube E.; and when the jar is 
completely full, turn the cock at A. and adjust the vessel H. . 
mits place. Hydrogen gas will quickly be formed ; the 
acidulous water in G, will be forced up into H ; then 
turning the cock A. the remaining water in K. L. will de- 
scend through E into the box below, and leave the jar filled 
with the gas; the fluid at the same time descending from 
-into G. Now, if you wish to set fire to the hydrogen, 
place a small iron or platina wire from N. to O. blow up 
the acidulous fluid into the calorimoter by the stop cock A; 
the wire will be instantly heated, and by turning the stop 
cock of the blowpipe M. so that the gas may strike the 
heated wire, it will be inflamed, and a taper may be light- 
d. The action of the. acidulous fluid on the zinc of the 
calorimoter, will furnish as much gas as will be consumed ; 
