The New York herald. [volume] (New York [N.Y.]) 1840-1920, 1877-11-12

Arm and which has been since sold to the Russian
government and she description Of which ana rs iriai
viii be especially appropriate at this time, Is the ID
ncn SO tou long jackeicd and hooped brecch-load-
ing cast steel riled gun, which was tho most prom-
pent object Herr Krupp's display at the Phila-
dsphia Exhipt,on. This gun carries steel shell
weighing l. l24H pounds using charge OF 2455a
pounds. The length Of the tube Is 26h ieet' or *
canbres The twist has a length OF 521s feet, or As
callbres, and is uniform There are SO rife grooves
having depth Of ll2th inch each and bread Of lands
rnE cYLIxpRo PRrsMATIcAL WEDGE.
The closing OF the breoch is effected by what 10
known q cylindro- prsmatical wedge This slides
into horizontal mortise OF the same shape, lei into
the breech piece The plug Is, Ike the gum OF Steel
and tho wedge and cylinder form one body The wedge
drawn out the left side The rounded part 10 VI
the rear that side giving greater bearing surface,
while the front side s dat and forms the bottom or end
OF the bore The brecch plug is moved in and out by
a transporting turned by crank, II being kept
IN position during The operation oy Leading lasts which
parallel the after edge The closing oil the 10
aperture LETT by the wedge and the prevention
Of escape OF gas breechward 10 effected by plato
circular ring. The ring Is steel circle fitting into
groove close TO the wedge aperture, at tho bottom
OF the bore. This is supplemented by plate which Is
circular aud slightly followed out and which is
entered on to tho wedge which Is cut out for this
purpose in front. IN order that when the brooch Is
closed It's slightly projecting rim shall meet the ring
which similarly projects the front side OF the
wedge hole. The vent is axlal, passing through the
brcech block, and Is lifted with copper lined, GYM
drcal steel vent tube.
PRoJEcrILEs AND CHARGE
Tho projectes used Tor this gun are Stcel, chhlco,
and fuse Shells These are guided in tho grooves by
pair Of copper rings the at the front end OF the
projecte being used for centerlng and that at the
rear end for imparung rotary motion to the shot,
Tho steel shells used weigh, without their bursting
charge 09 ~ pounds the chilled shells lao pounds,
the fuse shells 1873 pounds. Tho weight OF burst
ing charge for tho hist Is 3d. OF pounds; tor the Sec
0nd IL VI pounds and finally for the iuse she'll o. 10
pounds The powder used Is that known as prismnti-
CAL having specific gravity OF from 10 TO Lie For
steel anu chilled shots the normal charge is 242a
ponds, and Tor the fuse shells 275 pounds These
charges calculated TO give the following initial ve-
loces For the chilled shells, 54l feet; for the
lighter steel sheels sos ee and tor the fuse shells
1923 feet per second
THE RECORD TRIAL.
At the trial Of this gun at the butts the results OBJ
tanned satisfactory Tho proof projectlles used
Of cast iron, haheaded aud nearly cylindrical IN
form, having an average weight oil lll66 pounds.
Four kinds OF powder were uscu rst that prescribed
for service use-namey, prsmalical powder, having
peroratIon OF a inch IN diameter; seconu powder
OF similar shape, but with pcrtoratons; third,
grained powder. whose grams measure u TO
inch diameter and, Iourih, similar coarse grained
powder, In size from 10 3.l6 inches IN diameter.
All had specific GRANTEES OF from 70 to l. 10.
used IN the rs charge. but II was found that gun
OF this size II burned too quickly The weight oil the
charge for the lrs round was only 80 pounds On tue
second round, therefore, the prismatlcally shaped
powder with pertoration used, and the results
obtained were considered very satisfactory the gas
pressure remaining below the prescribed limit with
charges weighing ESQ % and 1911 pounds and Tho
combustion being equal. charge OF the largest size
course grained powder used for the last round.
This burned unevcnly ana imperiectly, much OF the
charge being blown out unburncd ut the mnzzle and
gave a very low velocity OF projectile Though ten
rounds fired the base was not sponged. 1t Is
noted the report that the marks OF the riding were
well Rroovcd on those proJectllcs which were picked
up after the trial.
The vciocitcs taken at q distance Of ll64 feet
from the muzzle
THK RESULTS TRIAL.