The Big Brother of the Rodman Family: 20-inch Rodman, Part 1 | To the Sound of the Guns

29 Мар 2014 | Author: | Комментарии к записи The Big Brother of the Rodman Family: 20-inch Rodman, Part 1 | To the Sound of the Guns отключены
Rodman 38

The Big of the Family: 20-inch Part 1

to look the biggest made during Civil War the largest the Rodman the 20-inch Gun.

Fresh the 15-inch prototype s and while nation was to war, J. Rodman proposed a gun on 17, 1861:

entire success has attended manufacture and of the gun, leaves doubt of ability to reliable guns even greater of bore 20 inches, to maneuver load with and without use of guns of caliber.

A gun, one thick, 210 length of and 20 total length, weigh about lbs.

A solid of iron, inches diameter, weigh about lbs . ordinary service need not over 3.5 thick; would about 725 and contain 38 lbs. powder making total weight the loaded about 763 . 1

went on suggest a pound powder for these He estimated force of solid shot equal the force of 10-inch solid Likewise one shell would the destructive of seven shells.  From estimates, Rodman the point —

And destructive effect such shells, compared with shot, upon ships and batteries, would in a higher ratio; whole crushing being brought bear upon single point the same .

I would out that s concern defeating ironclads likely with eye cast the Atlantic.


Army didn act upon s proposal two years.  April 1863 Pitt Foundry an order a 20-inch 2

In May 1864 Journal of and Arts a corespondent a wealth details concerning gun s As I already described Rodman method length, let highlight one not mentioned Rodman s experiments. Describing core inserted the mold casting —

The core is a cylinder of 17 inches diameter, closed one end, at the It is one inch and is longitudinally or like a in architecture, entire length, furrows being  an inch Around this wound a of the of ordinary cord, and this a of clay inch thick evenly spread the whole The object the grooving to allow free escape gas.  The prevents the from filling these grooves.

Casting took on February 1864 using furnaces, and couple backups.  about 20 some 85 of iron into the After two of the water cooling, added more metal in to better the sinking of the After about hours of the men the core. unlike the Rodman s gun was hot for water cooling.  the gunmakers a continuous of air.  until February was the finally pulled of the flask.  Yet gun remained and required more days cooling.  After the gun to a to machine the excess and smooth exterior.

As seen the chart the 20-inch dwarfed the Rodmans in respects.

Rodman 38 boat

Stephen Lyford inspected gun in 1864, giving registry number The gun went to York for And it still there

20-inch Rodman

(Special thanks my friend Coughlin who the photo posted the marker to )

I turn to trials, and discuss the 20-inch Rodmans by Fort after the War.

s proposal in Reports Experiments on Properties of for Cannon, the Qualities Cannon Powder; an Account the Fabrication Trial of 15-inch Gun Charles H. 1861), pages

Edwin Olmstead,  E. Stark, Spencer C. The Big Civil War Seacoast and Cannon (Alexandria NY: Museum Service, 1997), C169, page

Account of casting of gigantic (Rodman) at Fort Foundry . American Journal Science and May 1864, 296-301 .

Rodman 38 boat
Rodman 38 boat
Rodman 38 boat
Rodman 38 boat
Rodman 38 boat
Rodman 38 boat

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