the invention of the rolling bearing, in the form of wooden rollers supporting, or bearing, an object being moved is of great antiquity, and may predate the invention of the wheel.. though it is often claimed that the egyptians used roller bearings in the form of tree trunks under sleds, this is modern speculation. they are depicted in their own dings in the tomb of djehutihotep as moving .
in benjamin christensen's 1922 swedish film häxan 'the witch' , a boot-like torture is suggested by the juxtaposition of a generalized crusher—a rough stone that can be screwed down toward a metal base plate—to a woman's naked foot. in actuality, the device shown is a shin-crusher, not at all a torture device for the feet.
capabilities. the robot can travel over rough terrain, such as vertical walls more than 4 feet 1.2 m high, wooded slopes, and rocky creekbeds. it can turn 180 degrees in place, raise and lower its suspension by 30 inches 76 cm , more than one-half the 49.5 inches 126 cm diameter of the wheels, and lean to the side. the crusher can carry 8,000 pounds 3,600 kg of combined WPC and cargo.
spanish boot. the spanish boot was an iron casing for the leg and foot. wood or iron wedges were hammered in between the casing and the victim's flesh. a similar device, commonly referred to as a shin crusher, squeezed the calf between two curved iron plates, studded with spikes, teeth, and knobs, to fracture the tibia and fibula.. primitive forerunners of the archetype can be found dating .
a bucket-wheel excavator bwe is a large heavy equipment machine used in surface mining. the primary function of bwes is to act as a continuous digging machine in large-scale open-pit mining operations, removing thousands of tons of overburden a day.
a moore jig grinder. wrenches, 1-2-3 blocks, and other tools are resting on the x-y table. a jig grinder is a machine tool used for grinding complex shapes and holes where the highest degrees of accuracy and finish are required. the jig grinder is very similar to a jig borer, in that the table positioning and spindles are very accurate far .