Lever resistance (or load). It is common to call the input force "the effort" and the output force "the load" or "the resistance." This allows the identification of three classes of levers by the relative locations of the fulcrum, the resistance and the effort: These cases are described by the mnemonic "fre 123" where the fulcrum is in the middle for the 1st class lever, the "r"esistance is in the middle for the 2nd class lever, and the effort is in the middle for the 3rd class lever. The lever is a movable bar that pivots on a fulcrum attached to
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