1896, A Simple Freezing Device. 201 
6.* The larger pail is filled with ice and salt and the smaller 
one catches the brine which is poured back into the larger 
pail. A stop-cock at the lower pail regulates the flow; the 
former is fastened to the pail by a wooden clothes pin. 
Fic. 6. 
An inexpensive substitute for this form of the apparatus 
may be quickly made. A large wooden pail may be bored 
tear the bottom, a cork inserted and pierced by a glass tube. 
Plece of brass pipe, one inch in diameter, with a thread at 
fend may be sawed off an inch and a half from the end 
and converted into a freezing chamber by soldering in the 
brass. discs and inserting two straight tubes at the side. A 
glass tube drawn to the required aperture may be used in the 
Place of the stop-cock at the lower pail and other tubes of 
different apertures may be quickly substituted. 
Providence, R. 
$ 
For the use of this cut I am indebted to the courtesy of the Bausch & Lomb 
ester, N, Y. 
Optical Co., Roc 
Vol. XXI.—No, 4, 
