Howdy Again
Studying the drawings, it looks like a pretty big, clumsy device. I sure don't think I would want one dangling from my belt.
The interesting thing is that Rollin White was one of the patent engineers. Rollin White was the guy who patented the whole idea of boring the chambers through a revolver cylinder so it could accept cartridges. When S&W designed their first revolver they discovered White had beaten them to the punch with this idea and they wound up paying him a royalty of 50 cents on every revolver they produced.
The other interesting thing is that you mention the patent was applied for from Lowell Mass. I live a stone's throw from there, I wonder what White was doing in Lowell. Lowell was a textile city, the first in the US. It had a huge amount of mills devoted to manufacturing textiles, but I never heard any mention of White being here.
P.S. Well, seek and ye shall find. Apparently White set up his own Rollin White Firearms company in Lowell in 1861 when S&W could not keep up with the demand for their new pocket revolvers. When White left the company in 1864, the name was changed to Lowell Arms Company. I never knew that. So that must be when he patented the loading dohickey.