
202 STORRS AGRICULTURAL EXPERIMENT STATION. 
to pass into the interior of the bomb. ‘This channel may be 
tightly closed by the valve screw, the lower end of which is 
conical and thrusts against the inner surface of D, the angle of 
which at the place of contact corresponds to that of the tip of 
the screw. Between the top of the valve seat and the bottom 
of the packing (L), the valve screw fits so closely in the cover 
as to prevent the lead of the packing from working downward 
and thus obstructing the small gas passages. 
The upper edge of A is beveled on both sides; the apex is 
rounded, and fits into a gasket (K) of lead, which is held ina 
groove in the cover(B). With use 
the metal gradually flows out of the 
groove under the heavy pressure so. 
that the gaskets have to be replaced 
occasionally. The gaskets are easily 
made and extra ones are furnished 
with each bomb. One difficulty in 
screwing the collar down tightly 
enough to prevent the escape of gas 
between the edge of the cylinder 
and the gasket, at the high pressure 
to which the gases are subjected, is 
the friction of the collar upon the 
cover. ‘To accomplish this the cyl- 
inder of the bomb is put ina clamp 
especially devised for the purpose 
and described beyond. ‘The collar 
is turned by a long spanner, the pro- 
SS 
RES WW 


oN 
.. 
: 
iN 
NY 
_N 

ZZ 
Vi 
Y 





: 
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Ys 




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GY 
Y annmast jection of which fits into the two 
depressions shown in the collar at 
PP. The attempt was made to 

Fia. 2.—Cross SECTION OF Boms. 
replace the lead gaskets by a harder metal which would stand 
heavier pressure without flowing. Copper and an alloy of 
tin, antimony and copper were tried. ‘Io avoid the friction 
between the collar and cover induced by the very heavy pres- 
sure, ball bearings were used as described in the previous 
account of the bomb. Experience has, however, shown that the 
lead gaskets are preferable and the ball bearings are discarded. 
The platinum wires, H and I, inside the bomb, serve to hold 
a platinum capsule (O) containing the substance to be burned 

