348. Liquefaction and Solidification of Carbonic Acid. 
- The force of its gasefaction is alleged to be — to, but not 
so sudden as, that of gunpowder. 
The temperature at which the solidification took silage was 
presumed to be about —148° F.; although the experiments be- 
fore the committee'of the Academy shewed —124°. 
' Such is, in substance, the account by M. Thilorier of his novel 
and curious discovery, reported i in the Annales de Chimie. No 
description of the method of procedure, or’of the apparatus used, 
is annexed ; and we are left: to conjecture, and to the imperfect 
description of travellers, for any farther knowledge of either. 
_ Having. repeated the experiments of 'Thilorier, I deem it not 
useless to subjoin a draught of the instrument with which, aided 
by the suggestions of an intelligent pupil in France, and the as- 
sistanee of friends here, I was enabled successfully to repeat most 
of the experiments of Thilorier, and to verify some, and correct 
other, of his results. 
The apparatus consists of a generator of cast iron, A, supported 
by a wooden stand,.B, a receiver, F', also of cast iron, connected 
to the generator by a brass tube, anal fastened firmly to it by the 
stirrup screw, K; H, I, J, are stop-cocks, G, the nozzle of a pipe, 
L, a glass level-gauge, and 8, M, R,a pressure-gauge. 
_ The generator is 20 inches long and 6 inches in diameter ex- 
teriorly. Its cavity is 16 inches deep, and 3 inches, nearly, in 
diameter, so that it will hold about 4 pints. The walls are, of 
course, about 1% inches in thickness. At the top, an aperture of 
two inches in diameter is closed by a strong wrought iron screw, 
_ the shotilder of which is let in about a quarter of an inch. The 
collar is of block tin, turned to the size ofthe shoulder of the 
screw. ‘There is a hote in the head of the screw ‘iE for the re- 
ception of a long, ote iron bar. 
The copper cup, N, 13 inches wide, and 9 inelies long,. holds 
about 12 fluid ati There is a little handle at the top, and a 
copper Wire at the bottom, which makes the whole length a little 
less than that of the cavity of the cenenader, This cup is used 
to introduce the sulphuric acid. 
The brass tube between the oeneranm and receiver is divided 
into two parts of equal length, which admit of being united by 
means of a conical juncture, kept tight by the stirrup and screw, © 
K, K. -Each of these portions of the tube may be closed or 
opened at pleasure by a stop cock. One is. placed at I, another 
ee 6S ee 
