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10-foot point 50 m base 50 m points 50 m tape absolute error alignment plugs base-line tape bench standard BUREAU OF STANDARDS calibrated spring balance CIRCULAR Coast and Geodetic coefficient of expansion Comparator Correction COMPARISON OF TAPES Correction to length cross section designed Difference C.O.-Tape Difference Tape-CO distance end microscopes foot points geodetic comparator Geodetic Survey geodetic tape holding cut-off cylinder ice load iced bar interval invar l.CO Length of Comparator length supported throughout longer when supported loops Method of Support micrometer represents Microns millimeter mounted n.oi neutral surface piers precision pulley shown in Figure specified sphere spirit level steel tapes Support Difference supports at 24.0 suspended at points Tape is longer tape supported throughout tape suspended tape when supported Tape-testing Tapes conforming testing spring balances thermometers throughout at 24.0 throughout from observations total grade correction transverse graduation mark trough United States Coast upper surfaces vertical weight Woodward