Editing Lock (firearm) (section)

===Revolvers===

The commercially practical [[revolver]] followed from the advent of the percussion cap.  The action of cocking the hammer is used to rotate the [[cylinder (firearms)|cylinder]] and bring a loaded chamber in-line with the barrel preparatory to firing.  The mechanism for cocking, rotating and firing revolvers is contained between side-plates that form the frame of the revolver.  This is a significant departure from earlier lock mechanisms that were constructed about a single plate fixed to one side of a firearm.