Surface Machinery and Methods for Oil-Well Pumping Page: 76F
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BUREAU OF MINES BULLETIN 224 PLATE XXII
A. BUTTERFLY TYPE OF PENDULUM, USED AS A HOLD-DOWN
B. ONE-ARM BUTTERFLY WITH CONCRETE FOUNDATION
C. OLD CASING, AND STEEL ROD HOLD-OVER, a; FRICTION-POST SHACKLE
LINE SUPPORTS, b
BUREAU OF MINES
BULLETIN 224 PLATE XXII
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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/m1/103/: accessed May 30, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.