CONTENTS 



FIGURES--Continued Page 



10 Four- inch cylinder mounted in the flume 39 



11 Test section (force meter) 40 



12 Test section mounted in position 41 



13 Test section and force transducer 42 



14 Schematic of pipeline model 43 



15 Pipeline model 44 



16 Brush recording instruments 46 



17 Digitizer and recording instruments 47 



18 Calibration method for two-dimensional experiments 48 



19 Experimental arrangement for two-dimensional tests 49 



20 Calibration method for three-dimensional experiments 52 



21 Experimental arrangement for three-dimensional tests 54 



22 Definition sketch for three-dimensional experiments 55 



23 Example of data record 57 



24 Example of computer output for vertical least squares 



analysis 60 



25 Example of computer output for horizontal least squares 



analysis 61 



26 Resultant force through wave cycle for 0.001-foot clearance, 



1.85-second period, and 0.24-foot height 62 



27 Resultant force through wave cycle for 1/16-inch clearance, 



1.86-second period, and 0.24 foot height 63 



28 Resultant force through wave cycle for 1/8-inch clearance, 



1.85-second period, and 0.25-foot height 64 



29 Resultant force through wave cycle for 3/16-inch clearance, 



1.85-second period, and 0.25-foot height 65 



