CHAP. V.] DEEP-SEA SOUNDING. On 
much time and are too valuable to admit so large 
an average of losses. 
y 
) 
Fic. 38.—Brooke’s Deep-Sea Sounding Apparatus. 
About the year 1854, J. M. Brooke, passed-mid- 
shipman in the U.S. navy, a clever young officer who 
PZ 
