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Show A New W7 nf llnlllm VTslsr. It Is possible to make a pall nt water boll without pulling It on ths flro or applying cxtcrnnl hint to It In nny wny. In fact, you can make n pill of wntcr boll by simply stirring It wllh a big wooden spoon All you bnvo to do Is lo placo your water In a pall-It pall-It may bo lea water If necessary and stir It with a wooden spoon If you keep nt it long enough It will certainly certain-ly boll Five hours of rapid and constant con-stant stirring aro sului lent to perform tha feat successfully Iho water will after a time warm, nnd then It will grow hot so hot In fact Ihnt you tan-not tan-not hold your hand In It, nnd finally It will boll The point which the Inventor In-ventor of this trlek wishes to lllustrato Is what Is known as tho mechanical equivalent of heat It requires so many foot pounds nf work lo develop a given quantity of heat, lly turning tho spoon In tho wnter nt a regular speed It Is possible to find out Just how much work Is required to raise tho temper-aturo temper-aturo of water to ono degree. Heat Is developed In almost nny substance which la subjected to continuous or Tlolcut action |