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A lawn mower (also known as a grass cutter or simply mower, also often spelled lawnmower) is a device utilizing one or more revolving blades (or a reel) to cut a grass surface to an even height. The height of the cut grass may be fixed by the mower's design but generally is adjustable by the operator, typically by a single master lever or by a ...
The first known lawn mower had a cylinder cutting gear made of iron. [citation needed] It was used to mow sporting grounds and wide-ranging gardens.As manufacturers changed the design and structure of mowers, the cutting mechanism also developed and evolved into several varieties, including cylinder/reel blades, deck blades, mulching blades, and lifting blades.
Atco is the trade name for lawn mowers derived from the Atlas Chain Company, founded by Charles Henry Pugh in 1865, which made chains for ships. [1] [2]Mowing machines (replacing scythes) were drawn by horses but, after a horse died while pulling a mower around his company's facility, Pugh created a petrol lawnmower, which became the first of its kind to be mass-produced anywhere in the world.
Burrs are a rotary analog to files that cut linearly (hence their alternate name, rotary files). They share many similarities with endmills and router bits , with the notable distinction that the latter typically have their toolpaths dictated by the machine, while burrs are frequently operated in a freehand manner.
Air Test and Evaluation Squadron TWO ONE (HX-21) performs developmental testing and evaluation of all Navy, Marine Corps and Coast Guard rotary wing/tilt-rotor aircraft, Unmanned Aerial Vehicles (UAVs) and associated sensor and weapons systems. A wide range of aircraft testing and support is provided to include flying qualities, aircraft ...
Most intermeshing designs have two blades per mast, although exceptions such as the Kellett XR-10 with three blades per mast do exist. The arrangement was developed in Germany by Anton Flettner for a small anti-submarine warfare helicopter, the Flettner Fl 265 as the pioneering example, and later the Flettner Fl 282 Kolibri . [ 1 ]