I was researching an old 7-shot 22 H&R hammerless revolver I bought this weekend that is simply marked 22 Rim Fire on the barrel. I found an old advertisement that said this revolver was designed for 22 Short, 22 Long and 22 Smith & Wesson.

Hate to ask the obvious but I'm not familiar with a carriage called 22 Smith & Wesson. Is this similar to 22 LR? Which chambers fine BTW.