Lever force F at a point "A" located by the coordinate vector r on the bar. The lever then exerts an output force F at the point "B" located by r. The rotation of the lever about the fulcrum "P" is defined by the rotation angle "θ" in radians. Let the coordinate vector of the point "P" that defines the fulcrum be r, and introduce the lengths which are the distances from the fulcrum to the input point "A" and to the output point "B", respectively. Now introduce the unit vectors e and e from the fulcrum to the point "A"
Lever action Mossberg produces the 464 in centerfire .30-30 and rimfire .22. While the term "lever-action" generally implies a repeating firearm, it is also sometimes —and incorrectly— applied to a variety of single-shot or falling-block actions that use a lever for cycling, such as the Martini–Henry or the Ruger No. 1. Probably the first lever-action rifles on the market were Colt's 1st and 2nd Model Ring Lever rifles, both cap and ball rifles, produced by the Patent Arms Mfg. Co. Paterson, N.J.-Colt's Patent between 1837 and 1841. The ring-lever was located in front of the trigger. This loading-lever, when pulled, would index