Surface Machinery and Methods for Oil-Well Pumping Page: 76G
183 p. : ill.View a full description of this report.
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BULLETIN 224 PLATE XXIII
A. LONG-STROKE PENNSYLVANIA-TYPE JACK MADE FROM PIPE, IN OPER-
ATION: a, BACK SUPPORTS; b, SUPPORTING LEGS; c, SHACKLE LINE; d,
ARM; e, POLISH-ROD CLAMP; f, WORK ARM OF JACKB. OKLAHOMA-TYPE STEEL AND WOOD JACK IN OPERATION: a, SHACKLE
LINE; b, STRUCTURAL STEEL JACK; c, PITMAN; d, STRUCTURAL STEEL
BEAM; e, PIVOTBUREAU OF MINES
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George, H. C. Surface Machinery and Methods for Oil-Well Pumping, report, 1925; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc12407/m1/104/?rotate=270: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.