Surface Machinery and Methods for Oil-Well Pumping Page: 62A
BUREAU OF MINES
I a d"."T *
BULLETIN 224 PLATE XII
A. COUNTERBALANCE, a, ATTACHED TO WRIST PIN OF BAND-WHEEL
B. COUNTERBALANCE ATTACHED TO BEAM
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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/m1/81/ocr/: accessed July 28, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.