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Falling-block action military rifles were common in the 19th century. They were replaced for military use by the faster bolt-action rifles, which were typically reloaded from a magazine holding several cartridges. [2] A falling-block breech-loading rifle was patented in Belgium by J. F. Jobard in 1835 using a unique self-contained cartridge. [3]
Centrifugal casting, or centrifuging, [1] is used as a means of casting small, detailed parts or jewelry. [2] An articulated arm is free to spin around a vertical axle, which is driven by an electric motor or a spring. The entire mechanism is enclosed in a tub or drum to contain hot metal should the mold break or an excess of metal be used.
A lobster clasp, also known as a lobster hook, lobster claw, trigger clasp, or bocklebee clasp, is a fastener that is held closed by a spring. [ 1 ] [ 2 ] The lobster clasp is opened or closed by actuating a small lever, after which it is attached to (or removed from) a short link-chain or a ring-like structure.
Clasps to complete necklaces and bracelets; Earwires to link an earring to the wearer's ear; Ring blanks for making finger rings; Bails, metal loops, and jump rings, for completing jewellery. Jump rings can be used by themselves for chains; Pin stems and brooch assemblies; Tuxedo stud findings, letters of the alphabet, cluster settings, metal ...
Molten metal before casting Casting iron in a sand mold. In metalworking and jewelry making, casting is a process in which a liquid metal is delivered into a mold (usually by a crucible) that contains a negative impression (i.e., a three-dimensional negative image) of the intended shape.
In the era of commercial wrought iron, blooms were slag-riddled iron castings poured in a bloomery before being worked into wrought iron. In the era of commercial steel, blooms are intermediate-stage pieces of steel produced by a first pass of rolling (in a blooming mill) that works the ingots down to a smaller cross-sectional area, but still greater than 36 in 2 (230 cm 2). [1]
Lighter impurities and inclusions move towards the inside diameter and can be machined away following the casting. Casting machines may be either horizontal or vertical-axis. [1] Horizontal axis machines are preferred for long, thin cylinders, vertical machines for rings and bearings. [2] Castings usually solidify from the outside in.
The Tarpley carbine: This is categorized into falling block action, but the breech block is hinged, unlike the others. The Morse Carbine: This mostly brass action is somewhat like the Hall rifle, except it was designed to take a special centerfire cartridge. Very few of these were actually made; all were constructed in the late 1850s.