The evening telegraph. [volume] (Philadelphia [Pa.]) 1864-1918, 1866-07-25
GREAT GUNS !
Another 2O-inoh Gum Cast at Fort Pitt
works Puritanical KnOck.DOwn
AFgument-Tho Process and Dimen-



Argument-Tho Process and DImen-
BtOnB.
On Saturday, at twelve o'clock, number of
ladies and gentlemen we're assembled at Fort
Pitt foundry 10 witness the casting OF twenty
inch navy gun Tor the monitor Fm'ltdn, now
building in New York. This is the first gun OF
the size cast for the navy. Two other guns of
this size were. some time ago, cast Tor the army.
As lar as we are able to judge IRON the successful
manner in which the mould was filled with hot
metal the present gun is a perfect success, the
result of unremitting attention by Colonel
Joseph Kaye, who has been connected with
these works for twenty-seven years, and his
assistants. Very few of the guns cast at these
works ever fail OF being perfect. The one Just
cast will undoubtedly be taken from the mould
as complete. Some ten days will be required
before it viii be sufficiently cooled to be taken
out. 1t was cast on the Rodman principle-that
is, with stream OF cold water passing constantly
through the core.
Among the spectators was Captain Kholostaff,
OF the Russian Royal Mining Engineers, who has
been sent by that Government to inspect our
manufacturing establishments, our social and
political systems, in their every detail, with
view of reporting elaborately to his Government
on the practicability of that Government adopt.
ing them. He will strongly recommend the
Fort Pitt mode OF gun-casung He says they
have our monitors now, and to complete them
they need our guns-and they may need some
of our men, too.
The metal used in the casting of the present
gun amounted to 100000 lbs. 1t was heated in
lnree furnaces: NO. contained 6S,UUU lDS; NO. D,
800 lbs, and No. 6, 35, 200 OF this amount OF
metal, 10l, 900 lbs. was Juniata second fusion,
and $4,000 lbs. Juniata pig, from the Rodman
and Bloomfield furnace. 1T is considered the
best metal in the country for cast-iron guns.
The fires to heat this immense amount of
metal were Bindled at 4'35 A. NJ. on Saturday.
No. A was down, and the melting completed at
IL As, No. at 1915, and No. at 1045 A. NJ.
At 10 minutes past IL O'Clock furnaces Nos.
and were tapped, and No. few minutes
after. The time consumed in running the metal
from the furnaces into the mould was very
short. No. stopped at 1922; No. 5 at 1928,
and No. at 1924. The metal was very perfect.
AT the commencement OF casting, the tempera-
ture inside the foundry was 50 degrees, and
outside " degrees.
When the water commenced to run from the
hydrant into the core, the temperature was 81
degrees. When the core barrel was full the
temperature was 80 degrees. Ten minutes from
the time OF commencing the casting the ter
was ia degrees, and twenty minutes after l4S
degrees, at which temperature it stood as long
as we remained The density of this gun is sup
| posed to be somewhat lower than those pre-
| ylously cast, beng from 7'23 to 7'24.
The length of the rough casting is 236 inches.
| The maximum diameter is Co.. inches ana the
minimum 4S inches. When finished, the breech
OF the gun will measure GA inches in diameter,
and the nozzle 35B inches. The length of the
cylinder bore is l47 inches, depth OF chamber
| 10 inches. The thickness OF metal outside the
bore at the breach % inches and at the nozzle
| Z $40 inches The extreme length of the gun is
| lSS inches. Diameter of trunn on, lS inches. At
| 9'20 Sunday morning the water was turned off
| at which the temperature was 81 deg. At l045
yesterday the core barrel was holsted, when il
| came out perfectly clean, there being every in.
diCation OF perfect success in the casting. After
the barrel was hoisted out, very small stream
| of water was allowed to flow into the bore, when
| it Immediately became steam This will be con-
| tinueo until this morning at O'Clock, when a
| column of cold air will be forced in, and the
cooling process completed in this way.-PW it's.
| burg Commercial, 24h.