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In general, a spacer is a solid material used to separate two parts in an assembly. Spacers can vary in size from microns to centimeters. They can be made of metal, plastic, glass, and other materials. Shapes include flat sheet, cylindrical and spherical. Two sizes of metal standoffs and one plastic standoff.
Throat guards can be made of metal, leather, and/or plastic, and may be built in to a mask or attached separately. The guard was invented in 1976 by Los Angeles Dodgers trainer Bill Buhler after catcher Steve Yeager was impaled in the throat by pieces of a broken bat .
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The trampoline effect, which is common terminology for baseball players, is the phenomenon when the baseball "jumps" off the bat at contact. The bat-ball collision can be demonstrated from the physics of elastic collisions. The stiffer the barrel of the bat, the slower the baseball comes off the bat because it loses energy in the collision.
A concrete spacer with a plastic clip in use Concrete spacers in a precast element Diaphragm wall block on rebar for a Diaphragm wall. A rebar spacer is a short, rod-like device used to secure reinforcing steel bars, or rebar, within cast assemblies for reinforced concrete structures. The rebar spacers are fixed before the concrete is poured ...
Rounders is a bat-and-ball game played between two teams. Rounders is a striking and fielding team game that involves hitting a small, hard, leather-cased ball with a wooden, plastic, or metal bat that has a rounded end. The players score by running around the four bases on the field. [2] [3]