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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.
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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This is an accepted version of this page This is the latest accepted revision, reviewed on 2 January 2025. Ball used in the sport of tennis Tennis balls at the 2012 French Open A tennis ball is a small, hollow ball used in games of tennis and real tennis. Tennis balls are fluorescent yellow in professional competitions, but in recreational play other colors are also used. Tennis balls are ...
A vacuum bazooka is a pipe-based cannon which uses a vacuum pump (often a vacuum cleaner) to reduce pressure in front of the projectile and therefore propel a projectile as a result of the air pressure acting on its reverse.
The third book in the Yarros’ “Empyrean” series comes out in January from Entangled Publishing. The follow-up to “Fourth Wing” and “Iron Flame” swaps Basgiath War College lessons for ...