an idea is presented to the mind
*
peg model (cropped from border, plate unopened)
illustrating J. B. Case and H. B. Thompson. “Peg Models — their construction and use: an engineering method of presenting graphically the data to be used in planning, development and remedial work on oil properties.”
Summary of Operations, California Oil Fields 6:11 (May 1921): 5-21
University of California copy, digitized April 10, 2009
note: peg models apparently were made for most (or even all?) working oil fields.
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Tacks
Green Proposed depth of water shut-off
Brown Marker stratum
Yellow Water bearing formations
Red Oil or gas bearing formations
White Depth of water shut-off
Blue Bottom of hole
Clear Any estimated depth
Colored Disks
Blue — 4/10 in. diameter Successful water shut-off
Yellow — 4/10 in. diameter Unsuccessful water shut-off
Red — 2/10 in. diameter Oil present at test of water shut-off
Black — 4/10 in. diameter No test of water shut-off made
Strings
Brown Correlation of marker stratum
Yellow Correlation of water stratum
Red Correlation of oil or gas stratum
White Estimated correlation of any stratum
Blue / Green / Black Used for correlating any other persistent formations or zones.
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Mental forest — Space in which each ‘point’ is a crossroads.
Paul Valéry. Cahiers / Notebooks 3 (Brian Stimpson, et al., eds., 2010) : 200
tags:
construction; extrapolations; forests; logs; peg models
J. B. Case; H. B. Thompson; Paul Valéry