Surface Machinery and Methods for Oil-Well Pumping Page: 76C
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BULLETIN 224 PLATE XIX
A. POWER OR JACK-PLANT HOUSE, BIG MUDDY OIL FIELD, WYOMING:
a, SHACKLE LINE RESTING ON FRICTION-POST SUPPORTS
B. a, TAKE-OFF POST OF HEAVY BRACED TIMBER; b, TWO-POST PENDU-
LUM; c, COMBINATION BUTTERFLY
C. a, HEAVY TIMBERED POST CONCRETED IN PLACE WITH SHACKLE LINE
RUNNING IN HOLE BORED THROUGH IT; b, ROCKER USED AS HOLD-UP;
c, BUTTERFLY MADE OF TIMBER AND ATTACHED BY BEARINGS TO HEAVY
TIMBER POST; d, ATTACHMENT FOR SHACKLE LINE; e, END BRACE
BUREAU OF MINES
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George, H. C. Surface Machinery and Methods for Oil-Well Pumping, report, 1925; Washington D.C.. (digital.library.unt.edu/ark:/67531/metadc12407/m1/100/?rotate=270: accessed August 16, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.