The "Collier" Revolving Rifle was patented in 1818 by Artimas Wheeler in America and by Bostonian Elisha Collier in England. As a partner in the all-American concern, Bostonian Cornelius Coolidge patented the same design in France in 1819. Three Collier rifles and pistols are known today, for which the cylinder is advanced by a clockwork mechanism when the cock is pulled back. Additionally, over seventy-five Collier long guns and pistols out of the approximately 225 made have been presently identified whose cylinders are hand-rotated. Artimas Wheeler took out a second patent for a redesigned revolving cylinder gun in 1824, and the US Navy bought four for trials; two are revolving cylinder rifles and two seven-barrel pepperbox carbines. The Collier revolver, variously termed as the Wheeler, Collier and Coolidge gun, figure prominently in the 1851 and 1852 patent infringement trials that Colt brought against his competitors. In the trials, the defendants accused Colt of having taken and concealed what is believed to be the aforementioned 1680 Dafte revolver whose cylinder is advanced with a pawl and ratchet, so that it would not be available as evidence in the trial. The Dafte revolver is on display at the Royal Armouries, Leeds, England.
I don't have a Collier flintlock rifle to show, but I do own this pictured five shot Collier flintlock revolving pistol that shows the same cylinder, frizzen and lock area as does the rifle. The tolerances are very close, especially considering that the Collier flintlock revolver was manufactured in the early 1820s. On the long guns and the pistols, loading is through the front of the cylinder with a short rod after the cylinder plate is removed. The frizzen contains priming powder that is metered out to the pan for each shot.
A well researched book on Elisha H. Collier and his products and patents is being written and is to hopefully be released in late 2020 or 2021.