I've been reading the various threads on Howdah pistols and see mentioned Howdah rifles. The concept of the Howdah pistol I'm quite familiar with but am not when the term Howdah is applied to a rifle.

I'd THINK that such a gun would be a double rifle of large bore with VERY short barrels say, 12 or 16 inches or something of that sort but it appears that is not the case.

So what makes a Howdah RIFLE as opposed to a simple large bore double rifle?