Travel to U.S.: West: Pioneer Oil Fields of the San Joaquin Valley: Photo 6 The raising and lowering of pre-rotary cable tools--and, after the well was completed, the raising and lowering of the pump string--was handled by a redwood walking beam, driven originally by oil-fired boilers but later by electricity. The 6 by 6 beam standing vertically near the well is a headache post, designed to spare the driller a good braining if he was standing near the well when the crank apparatus failed. View: tiny * small * medium * big * biggest Photo Size Back to U.S.: West: Pioneer Oil Fields of the San Joaquin Valley chapter Short link for this page: http://www.greatmirror.com?justpic=5254

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