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Straight-line motion is linear motion of definite length or "stroke", every forward stroke being followed by a return stroke, giving reciprocating motion. The first such mechanism, patented in 1784 by James Watt , produced approximate straight-line motion, referred to by Watt as parallel motion .
From the standpoint of the balance of the horse, this is a very stable gait, and the horse need not make major balancing motions with its head and neck. [7] The trot is the working gait for a horse. Horses can only canter and gallop for short periods at a time, after which they need time to rest and recover.
Now alone, 23 turns around to look at the box, which is perched on the edge farthest from him. Without the others, 23 has to maintain the balance on his own, keeping the box out of reach. One step back and he falls, one step forward and the box falls. He can only watch as the box slowly winds down and plays its music, which 23 is unable to hear ...
The cam can be seen as a device that converts rotational motion to reciprocating (or sometimes oscillating) motion. [clarification needed] [3] A common example is the camshaft of an automobile, which takes the rotary motion of the engine and converts it into the reciprocating motion necessary to operate the intake and exhaust valves of the cylinders.
Some mechanisms that produce reciprocating, or repeating, motion are designed to produce symmetrical motion. That is, the forward stroke of the machine moves at the same pace as the return stroke. These mechanisms, which are often referred to as in-line design, usually do work in both directions, as they exert the same force in both directions.
Primary and secondary reciprocating-plane imbalances are present. Secondary reciprocating forces are high, due to all four pistons being in phase at twice the rotating frequency. Counterweights have been used on passenger car engines since the mid-1930s, [6] either as full counterweight or semi-counterweight (also known as half-counterweight ...
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The term may also refer to the horse's center of gravity. For the best performance by the horse, as well as for better balance of the rider, the rider must be positioned over the center of balance of the horse. The location of the horse's center of balance depends on a combination of speed and degree of collection.