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1942 Marshall Type M tractor. The first single-cylinder Marshall tractor to be introduced was the Marshall 15/30 in 1930. It had a 8-inch (200 mm) bore with a 10-inch (250 mm) stroke (= 8.237 litres) and the maximum speed was 550 r.p.m., or 9.1666 revolutions per second. In 1932 the 15/30 was upgraded to become the Marshall 18/30.
Marshall, Sons & Co. was a ... By 1989 a wide range of tractors were in production from 22hp to 125hp, plus they had a large spare parts business for the 120,000 ...
Geogrids are used to prevent sliding on long and steep slopes during installation and use of a landfill capping system. [1] A geogrid is geosynthetic material used to reinforce soils and similar materials. Soils pull apart under tension. Compared to soil, geogrids are strong in tension.
Geogrids represent a rapidly growing segment within geosynthetics. Rather than being a woven, nonwoven or knitted textile fabric, geogrids are polymers formed into a very open, gridlike configuration, i.e., they have large apertures between individual ribs in the transverse and longitudinal directions.
By integrating Geomembranes with Geogrids, an impervious membrane barrier is created, which offers enhanced strength and friction capabilities. This synergy not only provides superior tensile strength and durability but also improves the overall stability and performance of the system in various engineering applications.
A silt fence on a construction site.. Geotextiles and related products have many applications and currently support many civil engineering applications including roads, airfields, railroads, embankments, retaining structures, reservoirs, canals, dams, bank protection, coastal engineering and construction site silt fences or to form a geotextile tube.
A cotton picker at work. The first successful models were introduced in the mid-1940s and each could do the work of 50 hand pickers. Mechanised agriculture or agricultural mechanization is the use of machinery and equipment, ranging from simple and basic hand tools to more sophisticated, motorized equipment and machinery, to perform agricultural operations. [1]
The regular surface drainage systems, which start functioning as soon as there is an excess of rainfall or irrigation applied, operate entirely by gravity.They consist of reshaped or reformed land surfaces and can be divided into: