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The device is a small, independently rotating knob (similar to a U.S. classic door knob) facing the driver that is securely mounted on the outside rim of a steering wheel. [1] The protruding knob is an aftermarket accessory. The free rotation is intended to help make steering with one hand easier or faster.
In automobiles, these knobs were used in cars with power steering to make parking and turning corners easier. The old cars required a LOT of hand-over-hand turning to park or turn 90 degrees. These knobs allowed you to turn the wheel with the palm of your hand, without gripping anything.
The wheel and tire assembly attach to the hub or spindle of the knuckle where the tire/wheel rotates while being held in a stable plane of motion by the knuckle/suspension assembly. In the attached photograph of a double-wishbone suspension, the knuckle is shown attached to the upper control arm at the top and the lower control arm at the bottom.
A pontoon boat is a flattish boat that relies on nautical floats for buoyancy. Common boat designs are a catamaran with two pontoons, or a trimaran with three. [2] In many parts of the world, pontoon boats are used as small vehicle ferries to cross rivers and lakes. [3] An anchored raft-like platform used for diving, often referred to as a pontoon
A pleasure boat with two lengthwise pontoons. A pontoon boat is a flattish boat that relies on floats to remain buoyant. These pontoons (also called tubes) contain much reserve buoyancy and allow designers to create large deck plans fitted with a variety of accommodations including expansive lounge areas, stand-up bars, and sun pads.
This image is a derivative work of the following images: File:Steering_wheel_ship_1.png licensed with Cc-by-sa-3.0, GFDL . 2010-06-14T15:58:58Z ZooFari 1154x1155 (166697 Bytes) Removed background
In coxless boats, the bow is often responsible for giving calls to the crew. The bow pair of bow and "two", who are the two rowers closest to the boat's bow, are more responsible for the stability (called "set") and the direction of the boat than any other pair of rowers, and are often very technical rowers. The bow of a stern-coxed boat is ...
The steering pivot points [clarification needed] are joined by a rigid bar called the tie rod, which can also be part of the steering mechanism, in the form of a rack and pinion for instance. With perfect Ackermann, at any angle of steering, the centre point of all of the circles traced by all wheels will lie at a common point.