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IMPROVED FORMS OF BOMB CALORIMETER. 201 
tests of ‘‘ oil-tempered forgings made from the same steel and 
at about the same time the bars were made’’ which were used 
for the later bombs. ‘These latter tests ‘‘ were many in number, 
and an average taken from them gives the following results’’: 
Tensile strength, - - - - . 85,514 lbs. per sq. in. 
Elastic limit, = - - - - - : 47,366 lbs. per sq. in. 
Extension, - : - - : - 23.82 per cent: 
Contraction, - - - - - - 43.05 per cent. 
The cover, collar, and screws are of the best tool steel. In 
the apparatus”as now made the inside dimensions of the cyl- 
inder are, approximately: 
Depth, 12.7 cm.; diame- 
ter, 6.3 cm. at top and 5.9 
cm. at bottom. The wall 
is approximately .6 cm. in 
thickness. The weight of 
the whole bomb is not far 
from 3,200 grams, and its 
capacity nearly 380 cc. 
The cover is provided 
with a neck (D). Into 
this fits, at the top, a cyl- 
indrical screw (FE), into 
which in turn fits a valve 
screw (F). In the neck 
(D), where the bottom of 
the cylinder screw (E) 
rests, is a shoulder fitted 
with a packing of lead 
(L,). The pressure on this 
packing makes a tight closure upon the part of F which it sur- 



Fia. 1.—PARTS OF THE BOMB. 
~ rounds. On the side of D is an opening (G), into which may 
be screwed the coupling connecting the tube with the recep- 
tacle which holds the oxygen used for the combustion. The 
coupling when screwed in thrusts against a washer of lead 
at the end of G, which insures perfect closure. A narrow 
passage runs horizontally to a point just above the valve 
seat in the center of D. A similar passage runs from the apex 
of the valve seat perpendicularly downwards through the 
cover, ‘These two passages provide a channel for the oxygen 
