They Invented What? (No. 1)
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U.S. Pat. No. 3,963,275: Method of breaking free-standing rock boulders
What is claimed is:
1.) The method of fragmenting a free-standing boulder comprising
determining the average diameter of said boulder to determine the time required for sound to traverse said average diameter,
determining the compressive strength of said boulder,
selecting a projectile having a mass which will establish an impact stress within said boulder greater than the compressive strength of the boulder, when impacted upon said boulder with a velocity which causes an energy transfer to said boulder within a time less than said determined time,
loading said cannon with said selected projectile,
loading said cannon with a charge which when detonated will cause said projectile to impact upon said boulder with said velocity,
aiming said cannon at said boulder, and
detonating said charge.
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