CONTENTS 



Introduction P a g e 459 



Purpose of the machine 459 



General principles employed 4" 1 



The first machine and its principal defects 4"4 



The latest machine 4°7 



General description 4"7 



Loading the machine 47° 



The gauze bandings used 47 1 



Detailed description 47 2 



Method of towing 4^8 



Method of working up material collected 49 x 



The interpretation and charting of results 493 



The catching power of the machine 497 



Limitations of the method 49^ 



Some causes of mechanical failure 499 



Possible future developments in the machine design 500 



Acknowledgements 5 02 



Summary 5 02 



References 5°3 



Appendix: A test of the validity of the continuous recorder method . . 504 



Plates I-IV following page 510 



