240 
ME. GEOEGE GOEE ON ELUOEIDE OE SILYEE. 
is represented by the annexed sketch, fig. 7. A is a tube-retort 6| inches (= 165-1 
Pig. 7. 
~ ue cc. 
-Sod 
I 
i 
-%ao 
! \ j 
B 
-2-10 
A 
~20O 
Scate y 
-iao \ 
-140 
- 120 
C 
-ICO 
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-GO 
-x , c <_. 
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1 1 
1H; 
millims.) long and 1 inch ( = 25-4 millims.) wide. B and C are the two halves of a cylin- 
drical receiver 2 inches (=50*8 millims.) diameter and 6 inches ( = 152*4 millims.) high, 
the upper half, B, being 3 inches ( = 76-2 millims.) high, and fitting very accurately and 
tightly to about \ an inch ( = 12-7 millims.) of its height within the part C ; it has 
a tubulure D, into which the end of the retort A has been ground nearly air-tight to a. 
distance of "about ^ an inch ( = 12*7 millims.); and also a smaller tubulure E, ^ of an 
inch ( = 6*35 millims.) diameter, with a plug F, also ground*nearly air-tight; the lower 
half, C, has a tubulure G, \ of an inch ( = 6*35 millims) diameter, with a small hole 1, 
01 inch ( = 2*54 millims.) diameter in its lower surface; it has also a plug H ground in 
nearly air-tight, which is perforated with a hole about •§■ of an inch ( = 317 millims.) 
diameter in the direction of the dotted lines, so as to serve the purpose of a tap. 
The receiver was graduated as shown in the figure, its contents being 1917 cubic 
inches ( = 324 cub. centims.), and the contents of the retort 4*943 cubic inches ( = 81 
cub. centims.), or total contents of the apparatus 24*7 cubic inches (=405 cub. centims.) 
= 18*895 grains of chlorine, or 67*578 grains of argentic fluoride = 10 11 grains of 
fluorine. The total weight of the apparatus was about 5650 grains. The junctions of 
its different parts were made gas-tight by the mixture of melted paraffin and lampblack. 
One experiment made with this apparatus was as follows : — Closed the receiver portion 
with sticks of potash in it during sixteen hours. Reheated to near redness the retort, 
containing a boat with 69*71 grains of recently fused argentic fluoride, and (after having 
removed the potash) at once fixed the retort on the receiver, and cemented the junction. 
Inserted a horizontal glass exit-tube, about 8 inches ( = 203 millims.) long, in the tubu- 
lure E, with its inner end close to the boat. Passed a stream of pure chlorine into the 
apparatus by the opening G, and out by the exit-tube during about thirty or forty 
minutes, until I knew for certain (by means of a separate special experiment I made) 
that not more than of the total contents of the apparatus consisted of atmospheric 
air. Removed the exit-tube and inserted the plugs F and H, and cemented the junctions 
very carefully. Supported the receiver vertically with its lower end in mercury ; placed 
a wet rag upon the retort and tubulure at D, and kept it cold by a constant stream of 
