Cyclopedia of architecture, carpentry, and building : a general reference work (1912)
American Technical Society · Chicago : American Technical Society · leaf 171
s method of driving pilesconsists in raising a hammer made of cast iron, and weighing from2,500 to 3,000 pounds, to a height of 10 to 30 feet, and then allowingit to fall freely on the head of the pile. The weight is hoisted bymeans of a hoisting engine, or sometimes by horses. Whei\ an engineis… … %s o r>i rQ MASONRY AND REINFORCED CONCRETE 127 lowers the value of s in the formula given, as already mentioned.To guide the hammer in falling, a frame, consisting of two uprightscalled leaders, about 2 feet apart, is erected. The uprights areusually wooden beams, and are from 10 to CO feet…
Architecture · Building
Internet Archive · Kelly Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
