210 STORRS AGRICULTURAL EXPERIMENT STATION. 
One jaw of the vise is cast in the same piece as the base, 
which is securely bolted to a bench or table. ‘The movable jaw 
is hinged at the back and is drawn together through a maxi- 
mum distance of about .5 cm. by a lever with a very coarse 
half thread. A nut with a set screw provides for coarse regula- 
tion of the jaws. The jaws are lined with rather thin sheet ~ 
lead. The nearly cylindrical but slightly tapering space be- 
tween the jaws closes tightly around the bomb cylinder. ‘The 
lead lining insures a very close fit and tight grip on the smooth 
surface of the bomb and prevents it being scratched. When 
the bomb is held thus in clamps 
there is no difficulty in securing 
the collar tightly by use of a span- 
is seen in the foreground of Fig. 7. 
Lomb support, manometer, and 
couplings for filling bomb with 
oxygen from oxygen holder.—The 
oxygen here used is furnished by 
The S. S. White Dental Mfg. Co. 
of New York, in cylinders about 
125 cm. long and 18 cm. in diam- 
eter. By filling ata pressure of 
3,000 lbs. per square inch, 100 
cubic feet of the gas are forced 
into the cylinders, an amount 
sufficient for a large number of 
determinations. Fig. 8 shows 
Fia. 8.—APPLIANCES FoR Fittine the appliances for filling the 
pe EOUe: bomb. A cast-iron shelf fixed at 
a convenient height is provided with a socket in which the 
bomb rests; a hole in which a manometer support is held in 
place by a set screw; and a steel strap with thumb screw to 
hold the oxygen cylinder. Coupling tubes connect the bomb, 
manometer, and cylinder. A valve on the cylinder opens or 
closes the connection between the latter and the manometer. 
In like manner a valve on the bomb cover (Fig. 1) regulates 
the connection between the bomb and the manometer. By 
slightly opening the bomb valve and then gradually opening 
the valve on the oxygen cylinder, the gas is allowed to slowly 

ner about one meter long, which | 


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