UNITED STATES 

 COAST AND GEODETIC SURVEY 



J. E. HILGARD 



SUPERINTENDENT 



DEEP-SEA SOUNDING AND DREDGING 



SUPPLEMENT 



TO 



A DESCRIPTION AND DISCUSSION 



OF THE 



METHODS AND APPLIANCES USED ON BOARD 

 THE COAST AND GEODETIC SURVEY 

 STEAMER, "B LAK E" 



By CHARLES D. SIGSBEE 



LIEUTENANT-COMMANDER, V.. S. NAVY 



ASSISTANT IN THE COAST AND GEODETIC SURVEY 



WASHINGTON 



GOVERNMENT PRINTING OFFICE 

 1882 



