made in lengths up to crete, allowing it to stand, and then driving it into the while excavation is going on. After being driven they 300 feet. The system is therefore a continuous bond ground, a cap being used to protect the head. can be loaded immediately. Naturally they present system, which… … proper positions. The ties are made of round wire 3-16 inch diameter and are dropped down over the top of the steel rods. They are spaced from two-inch cen- Gilbreth’s pile must first be recorded. Gilbreth uses above the ground surface also does away with the ters at the bottom and top, to…
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