MONITORS.
The diagram represents the interior arrangement of the turret of the
Monitors for the long and short XV-inch guns.
415. NOMENCLATURE.
A. Ammunition-scuttle.
B. Starting-bar for revolving turret and training gun.
C. Shaft on which turret revolves.
D. Travelling-bar on which moves the shell-whip.
E. Position of Engineer stationed at bar to revolve turret and
train guns.
F. Compressor-wheel to check recoil, hove taut before firing.
G. Crank for running gun in and out.
H. Smoke-box of XV-inch (_Passaic_ class).
O. Officer at sight-hole.
P. Port-hole.
R. Port-stopper.
S. Sight-hole.
416. In the _Passaic_ class the ports for the XV-in. gun are only of
sufficient dimensions to allow the passage of the shot at such
elevations and depressions as were judged necessary: the gun being
fired entirely within the turret. In order to protect the crew of the
gun from the blast of the explosion, the smoke-box was devised, which
to a certain extent accomplished the desired object, but at the
expense of rapidity of loading.
417. In designing the _Tecumseh_ class it was decided to enlarge the
port, so as to allow the face of the muzzle to run out flush with the
exterior of the turret. The gun was therefore lengthened sixteen (16)
inches, and the muzzle turned down to the minimum size.
418. The contracted space within the turret rendered it necessary to
introduce additional mechanical aids in lieu of manual labor in
running out, loading, and checking the recoil.
[Illustration: MONITOR TURRET. D. Van Nostrand Publisher. Julius Bien,
pr.]
419. The exercise therefore conforms to the established exercise for
great guns only as far as circumstances will admit.
The gun is supposed to be run in, and not loaded.
420. WORDS OF COMMAND.
I. "PROVIDE THE GUN!"
II. "SERVE VENT AND SPONGE!"
III. "LOAD!"
IV. "PRIME!"
V. "ELEVATE!" (OR DEPRESS).
VI. "RUN OUT!"
VII. "TRAIN!"
VIII. "READY--FIRE!"
IX. "RUN IN!"
X. "SECURE!"
MANUAL EXERCISE.
(RIGHT GUN.)
II. "SERVE VENT AND SPONGE!"
421. Gun Captain serves, then stops the Vent. No. 3 passes to left of
muzzle. No. 4 receives the moist Sponge-head from 6, and, assisted by
3, enters it in the Bore and forces it down as far as the first
section. No. 6 passes the successive sections of the staff to 4 as
needed, and receives them from him as the sponge is withdrawn.
After the sponge is withdrawn, Captain serves the Vent with his
priming-wire, and again closes it.
III. "LOAD!"
422. No. 4 receives Cartridge from 5, to whom the box has been passed
by 13, assisted by 3, enters it in the Bore; receives Rammer-head and
successive sections from 6, and, assisted by 3, rams home. Nos. 3 and
4 fall back from the muzzle. Gun Captain serves the Vent to feel if
the Charge is home.
Nos. 3 and 4 return the rammer.
Nos. 7 and 8, 11 and 12 whip up Shot (or shell), as has been
previously ordered. Nos. 11 and 12 choke luff of whip. Nos. 7 and 8
run shot (or shell) to the muzzle. No. 5, assisted, if necessary, by
No. 6, bears over, when 3 and 4 enter and ram home by sections.
No. 4 removes Patches and passes them to 7, who hands them to Gun
Captain.
IV. "PRIME!"
423. Gun Captain again makes sure that the Vent is clear. No. 2 primes
with priming-powder from a flask or a blank musket-cartridge.
V. "ELEVATE!" (OR DEPRESS).
(Always done before running out.)
424. No. 2 handles lever of Elevating screw under the direction of the
Officer of the piece, who sets the trunnion-sight at the proper degree
of elevation and clamps it there. When the bubble of the
trunnion-level is in the centre,--"Well."
Nos. 3 and 4 lift the muzzle by a section of the rammer-handle; the
preponderance not being sufficient to overcome the friction of the
trunnions in the cap-squares. No. 3 passes to the right of the muzzle.
VI. "RUN OUT!"
425. Nos. 7, 8, 11, and 12 man Truck-crank to run out. Nos. 9 and 10
ease compressor. Nos. 3, 4, 5, and 6 man port-tackle: as muzzle
approaches port-stopper, "Open Port!"
As soon as the gun is out, Nos. 11 and 12 unship truck-crank and place
it clear of gun-slide. No. 9 to Compressor-wheel, which he heaves hand
taut. No 10 ships ratchet-levers and heaves well taut.[43] Gun Captain
inserts percussion-primer.
VII. "TRAIN RIGHT!" (OR LEFT).
426. The officer of the gun sights through sight-hole, and orders
"Right!" or "Left!" as the muzzle is to go. The Engineer at the
starting-bar revolves the turret.
No. 1 to lock-string; when the object comes in view, Officer of piece
gives order.
VIII. "READY--FIRE!"
427. Gun Captain pulls lock-string. No. 3 lets go port-tackle. No. 5
closes port. Engineer revolves the turret so as to point the gun
abeam. (This gets the scuttle clear for passing up ammunition.)
[Illustration: TRUNNION LEDGE AND LEVEL FOR XV INCH GUN. D. Van
Nostrand Publisher. Julius Bien, pr.]
_If necessary,_
Nos. 11 and 12 ship crank, and, with 7 and 8, run the gun in; Nos. 9
and 10 easing compressor. No. 10 ships ratchet-lever to ease
compressor, No. 9 easing it further by hand. The gun is now ready for
loading, and the exercise proceeds as before.
428. The exercise of the left gun is in all respects the same, except
that Nos. 3 and 4 exchange duties.
429. The crew of the XV-in. gun consists ordinarily of 14 men, but the
gun may be readily worked by 8 men; indeed, some officers prefer the
smaller number as being equally efficient, giving more room in the
turret, and affording the very great advantage of relief crews during
a protracted engagement. The same remarks apply to the XI-in. gun.
WORKING XV-IN. BY HALF-CREW.
"SERVE VENT AND SPONGE!"
430. No. 1 stops vent. 3 passes to left of muzzle. 5 passes
sponge-head and sections as required to 3, and assists in sponging.
"LOAD!"
431. No. 13 receives passing-box at scuttle and holds it to 5. 5
receives cartridge from 13, enters it in muzzle, passes rammer-head
and sections, and, assisted by 3, rams home. Gun Captain serves the
vent, 3 and 5 falling back.
Nos. 9, 11, 13, and 15 whip up shell and attend it to muzzle.
Nos. 5 and 3 steady shell and enter it in muzzle.
No. 5 removes patch, passes it to 7, who hands it to 1.
Nos. 5 and 3 ram home by sections as before.
"ELEVATE!"
432. Nos. 3 and 5 raise muzzle by section of rammer.
No. 1 tends elevating screw.
"PRIME!"
433. No. 1 serves vent and primes with powder.
"RUN OUT!"
434. Nos. 7, 11, and 15 man crank.
No. 9 eases compressor.
Nos. 3, 5, and 13 open port.
_When out,_
No. 1, Gun Captain, inserts percussion-primer.
No. 11 unships crank.
No. 9 heaves compressor hand taut.
No. 15 ships lever and heaves well taut.
The gun is trained as before.
"FIRE!"
435. Nos. 3 and 5 close port.
Nos. 7, 11, and 15 man crank, and 9 eases compressor. The above is
given for the 1st part of gun's crew; for 2d part substitute next high
numbers in each station.
SHELL AND POWDER DIVISION.
436. To the Shell and Powder Division is assigned the most laborious
and difficult of all the duties--that of keeping up a supply of
projectiles.
437. It is therefore necessary to have it strongly manned, and a
system of frequent reliefs for all the important stations,
particularly in the magazine and shell-locker.
438. There are required three gangs of four each for the passage of
projectiles: one to whip them out of the hold, or shell-room; a second
to pass them to the door of the turret-chamber; and a third to pass
them to the scuttle and adjust them in the bearer. When working with
half-crews, the third gang assists at the shell-whip, the fall being
dropped down to them.
439. The XV-in. passing-box requires two men to carry it to the
turret-chamber.
440. The allowance of projectiles can only be determined by the
character of the service expected, and the stowage capacity of the
vessel, which is limited to about 150 rounds per gun for sea-service.
441. By reason of the contracted space in these vessels, all shell
should be filled, and all powder must be made up into cartridges.
442. All XV-in. shell shall be fitted with three fuze-holes, and
issued for service fuzed with 3-1/2, 5, and 7 seconds fuzes.
443. When the distance of the object is known to be less than the
range of the shortest fuze, and time will admit of doing so, uncap all
the fuzes. At other times uncap the fuze suited to the distance, and
the one of longest time of burning.
[Illustration: NOMENCLATURE OF 13 INCH MORTAR. CARRIAGE AND CIRCLE. D.
Van Nostrand Publisher. Julius Bien, pr.]
FOOTNOTES:
[43] The compressor-shaft should be marked as a guide to No. 1 to know
when compressed sufficiently.