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If engineers need to clear a path (an operation known as breaching), they may be under heavy fire and need supporting fire to suppress the enemy or obscure the site with smoke. [14] Some risk of casualties is accepted, but engineers under heavy fire may need to clear an obstacle in 7–10 minutes to avoid excessive casualties, so manual ...
A typical chain tool. With a chain placed on the central sprocket, the screw is turned until a pin is pushed from the linkage. A chain tool is a small mechanical device used to "break" a bicycle chain in such a way that it can be mended with the same tool. A bicycle chain has links and plates that are pinned together; these pins can be pushed ...
The chain and disk rotate to stay clean while breaking up the top surface to about 1 inch (3 cm) deep. A smooth seedbed is prepared for planting with one pass. Harrowing with tractor and disk harrow in the 1940s) Chain harrowing can be used on pasture land to spread dung and break up dead material (thatch) in the sward. Similarly, in sports ...
Drive shafts tend to be tougher and more reliable than chain drive, but the bevel gears have far more friction than a chain. For this reason virtually all high-performance motorcycles use chain drive, with shaft-driven arrangements generally used for non-sporting machines. Toothed-belt drives are used for some (non-sporting) models.
He took out a patent in 1901 for tarmac. [13] Hooley's 1901 patent for tarmac involved mechanically mixing tar and aggregate prior to lay-down, and then compacting the mixture with a steamroller. The tar was modified by adding small amounts of Portland cement, resin, and pitch. [14]
Tarmac was first listed on the Birmingham Stock Exchange in 1913 and then the London Stock Exchange in 1922. [6] During the 1920s and 1930s, Tarmac had to cope with national strikes, recession and periods of intense competition. Nevertheless, the company gradually expanded its geographic coverage (particularly in the south east), increased its ...
Oregon Tool is the largest manufacturer of saw chain in the world, with the Oregon brand holding the title of #1 saw chain in the world. Saw chain sold under the Oregon brand is sold to OEMs, dealers, and direct-to-consumer. Other products sold under the Oregon brand include: chain saw bar, sprocket, lawn mower blades, and string trimmer string.
A brushcutter (also called a brush saw, clearing saw or gasoline goat) is a powered garden or agricultural tool used to trim weeds, small trees, and other foliage not accessible by a lawn mower or rotary mower. Various blades or trimmer heads can be attached to the machine for specific applications. It consists of: A power unit held close to ...