Surface Machinery and Methods for Oil-Well Pumping Page: 76D
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BULLETIN 224 PLATE XX
A. POWER EQUIPPED WITH TAKE-OFF POSTS, a, SHOWING TAKE-OFF
ROD b, AND WELL TAKEN OFF POWER c
B. a, TAKE-OFF POST MADE OF OLD PIPE; b, STEEL-ROD PENDULUM; c,
ONE-POST PENDULUM; d, BUTTERFLY OF TIMBER ARMS AND PIPE
BRACES; e, POWER AND JACK ATTACHMENT FOR SHACKLE LINES
C. TAKE-OFF RODS AND RAIL IN USE; SHACKLE-LINE ATTACHMENT AT a
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/m1/101/: accessed December 15, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.