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A court shoe (British English) or pump (American English) is a shoe with a low-cut front, or vamp, with either a shoe buckle or a black bow as ostensible fastening. Deriving from the 17th- and 18th-century dress shoes with shoe buckles, the vamped pump shape emerged in the late 18th century.
The Timberland boot was introduced in 1973. [7] Its popularity grew, prompting the Swartzes to discontinue manufacturing for others and concentrate on expanding their own brand. [8] The Abington Shoe Company was renamed The Timberland Company and incorporated in 1978. [3] [9] Jeffrey Swartz, grandson of founder Nathan Swartz, joined the company ...
Generally, a flat tubular lace will stay tied more easily than a round lace with a core because the flat lace can be more crimped within the knot. Most laces, however, are round and have core of cotton yarn, especially boot laces. For these to stay tied securely, the core on the inside of the lace must be soft and compressible.
The first bicycle pump consisted of a metal cylinder that had a metal rod running down the middle of it. This would have forced the air out of the cylinder and then sucked in new air when the metal rod was pulled up again. Many modern pumps use a very similar method, while some, such as the electric pumps, use an automated pumping mechanism.
Pump Characteristic curve; the head produced reduces with the discharge of the pump. Pump curves are quite useful in the pump selection, testing, operation and maintenance. Pump performance curve is a graph of differential head against the operating flow rate. They specify performance and efficiency characteristics.
An oil diffusion pump is used to achieve higher vacuum (lower pressure) than is possible by use of positive displacement pumps alone. Although its use has been mainly associated within the high-vacuum range, down to 1 × 10 −9 mbar (1 × 10 −7 Pa), diffusion pumps today can produce pressures approaching 1 × 10 −10 mbar (1 × 10 −8 Pa) when properly used with modern fluids and accessories.
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