How to Raise a 25-Ton Cannon: Elevation System for Rodman Guns | To the Sound of the Guns

20 Май 2014 | Author: | Комментарии к записи How to Raise a 25-Ton Cannon: Elevation System for Rodman Guns | To the Sound of the Guns отключены
Sunseeker 66

How to a 25-Ton Elevation System Rodman Guns

I covered mechanical operation the elevating on pre-Civil columbiad gun .  This of elevating worked for seacoast howitzers, even a Navy shell that entered from the to the of the Almost all columbiads used system.  Even first batches Rodman guns the system.

the weight the larger guns exceeded practical limits the Columbiad system. The problem was preponderance required keep the on top the elevating (specifically the While this the elevation true during during handling preponderance made gun crew work difficult not outright The 15-inch entering service 1861 exceeded limits of a reasonable crew could 1,200 pounds. So an system came use.

To my no documentation the experiments design of modified elevation The Rodman arrived on scene about same time wrought iron for seacoast However the diagrams of guns on carriages seems show the style elevating

At some that elevating gave way this:

Breech 15-inch Rodman Fort Foote

post, sometimes to as ratchet post, the elevating elevating box, pawl of earlier arrangement.  the crew inserted the bar directly the post against the on the face.  With the crew lever the s breech or down.  s how manual of described the

No. 4 mounts upon chassis and, through the with the raises or the breech directed by gunner. 1

simple.  Angle gun appropriately.  as seen this posed from Battery Alexandria, Virginia.

bar had squared off to fit the sockets the gun breech.

Close of Sockets 15-inch Rodman

did Archimedes about just a place stand?  And the post not touch breech.  And is no screw or point supporting breech.

Inside of Post

Inside post are slots with open ends the breech.  these engaged pins or fittings on elevating bar.  orientation would the bar remain firmly while the worked.

Now exactly was an improvement the older system?  Well note of 15-inch gun profile.  How points does gun itself the carriage?


Cranchi 41 Mediterranee boat

Rodman — #1

Give a gold if you two points.  the trunnions the carriage the spacing the post So even 150 years, 25 ton balances on trunnions.  After 15-inch Rodman and small of 8- 10-inch models, Rodman guns cast without by moving trunnions just few inches So instead working against pounds of while elevating piece, the 4 man only to the lever or down.

But with careful balance, ve often just loading piece would to drop gun off The addition a 450 solid shot create a dangerous teeter-totter.  the manuals not indicate retaining the bar in during firing prevent the of the The orientation the slots the post allow such, not allowing bar to loose when gun fired.  at least photo shows bar remaining place with gun in this one credited to Rodgers.

Another photo as Battery shows a brought back a stowed If you close, laying the elevating is the bar.

So, these big the crew a much job with as compared the older Still, ease use must taken in The rate fire for well drilled on a Rodman was round every minutes. 2 without preponderance the breech, moved slowly these heavy monsters.

Notes:

John Tidball, Manual of Artillery Service: the Use the Army Militia of United States J. Chapman,   Page .

Ibid, 127 .

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