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  Monday, June 7, 2010
  Largest piece of chalk 
- Bishop Canevin students sets world record
  PITTSBURGH, PA, USA -- Terry Dougherty, Matt Durbin and Nick Sylvester, 11th-grade students at Bishop Canevin High School, made a 270 pounds piece of chalk from plaster of Paris and water , setting the world record for the Largest piece of chalk.
   Photo: Terry Dougherty, with classmates Matt Durbin and Nick Sylvester behind him, checks the weight of the Largest piece of chalk in The World they made for history teacher Joseph Romano at Bishop Canevin High School. Photo by Darrel Sapp
  (enlarge photo)


   "[The World's Largest piece of chalk ] writes and everything," Mr. Sylvester said. "But it's 270 pounds, so it's pretty hard to write with."

   Typical blackboard chalk is manufactured from gypsum, which is a kind of calcium sulfate. Sidewalk chalk is also manufactured from gypsum, but it can be made from plaster of Paris and water, the method chosen by the Bishop canevin students.

   Nick Sylvester of Kennedy wanted to make the World's Largest piece of chalk in a 32-gallon trash can, and so he purchased enough plaster of Paris to fill the can more than halfway up. He bought 125 pounds of plaster from Home Depot for around $60.

   Working with classmates Matt Durbin of Robinson and Terry Dougherty of Crafton, he mixed the plaster with 14 gallons of water in the trash can.

   It took them about 15 minutes to adequately stir the mixture using a golf club and a metal rake, and it took three days before the mixture set.

   The World's Largest piece of chalk is white, weighs about 270 pounds, and looks much like a normal piece of chalk except for its unusually large size and the patterning caused by grooves in the trash can.


 
   To compensate for their time and effort, Mr. Romano will give the boys 15 to 20 extra credit points.   

   Meanwhile, the Largest piece of chalk in The World has found a permanent home in his classroom. "I'll probably chip away at it," Mr. Romano said.

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   Related world records:
  Largest violin - German luthiers

   Largest Pen
- M.S. Acharya

   Longest rubber band chain - Allison Coach 
    
   Largest Concrete Gnome - Iowa State University

   Longest gum wrapper chain - Gary Duschl

   Longest string of beads - Shipwreck Beads


  Largest Ball of Paper - nrique Miramontes and Ricardo Granados

   Largest rubber band ball - Joel Waul

   
Largest Ball of Plastic Wrap - Jake Lonsway
 
   Monday, June 7, 2010

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