ses are bon wedge, 3. The electric wave system is formed by of Georgia pine, oak or maple. In connection with identical. connecting the vertical wire to the metal wedges and drop hammers there is now used extensively a pro- The great advantage of the magnetic detector, as the earthed wire to the… … the pile, gives results that are vantageous, yet it would seem surprising to persons whose ex- that the wide divergence between * perience has been limited to resistivity and its reciprocal, drop-hammer pile drivers. As which is necessary in a detector s. an indication of the economy of to enable a…
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