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A pneumatic exercise machine or pneumatic exercise equipment is an exercise machine or equipment for physical exercise whose function is based on pneumatics, as opposed to or in combination with for example cables or hydraulics.
A ratchet (occasionally spelled rachet) is a mechanical device that allows continuous linear or rotary motion in only one direction while preventing motion in the opposite direction. Ratchets are widely used in machinery and tools. The word ratchet is also used informally to refer to a ratcheting socket wrench.
Aquatic timing systems are designed to automate the process of timing, judging, and scoring in competitive swimming and other aquatic sports, including diving, water polo, and synchronized swimming. [1] These systems are also used in the training of athletes, and many add-on products have been developed to assist with this process. [2]
Socket set with ratchet (above), four hex sockets and a universal joint. A socket wrench (or socket spanner) is a type of spanner (or wrench [1] in North American English) that uses a closed socket format, rather than a typical open wrench/spanner to turn a fastener, typically in the form of a nut or bolt.
An exercise class using exercise balls A wide range of exercises can be performed with an exercise ball.. An exercise ball is a ball constructed of soft elastic, typically in 5 diameters of 10 cm increments, from 35 to 85 cm (14 to 33 in), and filled with air.
The hand-winding movement of a Russian watch. A mechanical watch is a watch that uses a clockwork mechanism to measure the passage of time, as opposed to quartz watches which function using the vibration modes of a piezoelectric quartz tuning fork, or radio watches, which are quartz watches synchronized to an atomic clock via radio waves.
Later Swiss and American manufacturers used the inline lever, in which the lever is inline between the balance wheel and the escape wheel; this is the form used in modern watches. In 1798, Louis Perron invented an inexpensive, less accurate form called the pin-pallet escapement , which was used in cheap " dollar watches " in the early 20th ...
Ratcheting is a significant effect to be considered to check permanent deformation in systems which undergoes a cyclic loading. Common examples of such repetitive stresses include sea waves, road traffic, and earthquakes. [ 8 ]