James Rifles

From Wikipedia.

James Rifles were the generic terms to describe any cannon rifled to the James Pattern.  Charles T. James developed a rifled projectile and rifling system.

James worked with the Ames Manufacturing Co. of Chicopee, Massachusetts, to produce 3.80" bore rifled cannons and there are at least six-known variants, collectively referred to as 14-pdr. James Rifles.

Some were converted 6-pdr. Model 1841 cannons which had their bores increased to 3.80" and the n riffled.  The other five variants were newly-cast cannons.

James projectiles were falling out of favor by the time of James' death in 1862 and most gradually phased out.

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