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PVC dry ice cannon in use, 1.5kg (3 pounds) of concrete is poured at the bottom to reinforce it, and plastic sleeves are used to stiffen the lower (highest pressure) part. The oldest examples simply involve dropping pieces of dry ice into a tube closed at one end and sealing the other end by jamming the projectile in.
Backyard Ballistics : build potato cannons, paper match rockets, Cincinnati fire kites, tennis ball mortars, and more dynamite devices. Chicago: Chicago Review Press. ISBN 978-1-55652-375-5. OCLC 45861947. Gurstelle, William (2003). Building bots : designing and building warrior robots. Chicago: Chicago Review Press. ISBN 978-1-55652-459-2.
Vacuum cannon photo diagram. The vacuum bazooka uses a straight tube which is sealed with a type of bursting disk composed of 2 - 4 layers of aluminum foil at the muzzle and by the projectile at the breech. A tee-piece near the muzzle allows application of vacuum.
Modern-day Spaldeen. A Spalding Hi-Bounce Ball, often called a Spaldeen or a Pensie Pinkie, is a rubber ball, described as a tennis ball core without the felt. [1] These balls are commonly used in street games developed in the mid-20th century, such as Chinese handball (a variation on American handball), Australian Handball, stoop ball, hit-the-penny (involving trying to make a penny flip on a ...
A Galilean cannon with proportions similar to the Astro Blaster. A Galilean cannon is a device that demonstrates conservation of linear momentum. [1] It comprises a stack of balls, starting with a large, heavy ball at the base of the stack and progresses up to a small, lightweight ball at the top.
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The use of speed glue has been found to increase the elasticity of the racket, which adds speed and spin to the ball. Speed glue works by its solvent vapours which make the porous cells of soft rubber expand. This stretches the rubber giving it a tension that in turn makes the ball behave like an object meeting a trampoline.
In 1910, Penn began manufacturing tennis balls in Jeannette, Pennsylvania. [3] Penn has a subsequent history of innovation in tennis ball design: [4] In 1922, Penn makes the first pressurized ball cans. In 1960, Penn invents a more durable felt cover for the tennis ball by weaving New Zealand wool and artificial fibers together.