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...determined from a series of nomograms for most sizes and materials. Crank, hydraulic or multiram presses are used for cold forging and extrusion. Fast process: 600–1800 parts h-1. Impact extrusion and the Hooker process use a high velocity impact of the top punch to either backward or forward extrude soft metals such as tin, lead or aluminium into collapsible cans,...

...determined by the electrochemical equivalent of the metal. [Diagram to demonstrate 'Electrochemical machining (ECM)' - see article] Manufacture: An alternative to EDM and USM, best suited to complex shapes and repetitive production such as multiple hole formation. Automatic deburring and rounding of corners due to higher current densities at edges and corners. Operates at...

...determines the resolution - the bigger the diameter, the better images you will see. Small telescopes are generally not worth the cost - refractors below 3” diameter and reflectors below 4” are generally not as good as the binoculars described above. Also important is a sturdy tripod to mount the telescope on, as the ones provided can sometimes be too unsteady for a...