This transcription has been completed. Contact us with corrections.
[[on reverse of previous page]] 4070 3730 [[image - drawing of cut-away view of double-walled pipe, with up and down arrows]] [[image - drawing of cut-away view of pipe bottom, with interior wire basket]] [[image - drawing of two concentric circles, with inner diameter marked as ' 3 1/2 ']] [[image - drawing of cut-away view of pipe bottom, as above, but without basket, and surrounded by checkmark-type indications of surrounding soil]] [[image - drawing of four long vertical parallel lines, with arrown points on bottom of left-most and right-most lines]] [[long division for 11.00 รท 16:]] .69 ________ 16 ) 11.00 96 --- 140 144 [[/long division]]