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Grade, gallton <br />0 20 40 60 <br />1900 - <br />- cement <br />7?_ . <br />2000 = \ <br />Depth, <br />feet <br />Perforations <br /> ?? <br />Two for gas-vapor <br />4100 _ possible production <br /> vapor out let <br /> <br />-_ locations <br />T r <br />,-borehole <br />casing Retort Interval <br />% <br />Advancing 25 gal/ton <br />retort boundary <br />retort boundary <br />perforations for <br />oil vapor out <br />\ heater <br />Perforations <br />for water and --? <br />liquid oil return <br />Insulated sump <br />higurc 6-I. ,1'cheinalic del iclioll o ' in( •lilled hecrle'l' /)rodllcel. we// within 1/7" R/ inlrri'ul. <br />,Vole. dr(m 1/1K nol lu scah'. <br />• <br />•