Page Column 



923 2 10th entry fran bottom. For "When required" page no. is 796 . 

 9th entry from botton. For "Seavalley" page no. is ^. 



925 2 8th entry. For Indentifyiny read Identifying . 



Shoals, Prior surveys. Insert comraa(,) after "surveys". 



926 1 Simultaneous comparisons, Sounding Record. Change 2nd page no. from 



762 to 760 . 

 Simultaneous comparisons, Tabulations for season. Change page no. from 



510 to ^. 

 Sinker for detaching rod. The two page nos. are 396 and 4IO . 



927 2 14th and 13th entries frcm bottom. Page nos. are interchanged. After 



6545, correct page is 611 ; and after "fig. 136", correct page is 612. 

 931 1 Under "Speed, survey vessel", aline "scales, graphic" vertically under 

 preceding entry. 



934 2 Three-point fix(es). Transfer the ref. and page no. entries to the 



preceding entry, "Three-letter station names". 



935 1 Last entry. For evel read level . 



936 . 1 Tracing cloth distortion (table 23). Change ref. no. to 711^ . 



937 1 Trolley soundings. Change ref. no. to 311^b . 



2 9th entry. Missing ref. and page nos. after "Plotting survey ship " 



are 3463 and 26$ , respectively. 



938 1 8th and 7th entries beginning with the words "Change" and "curves" should 



be vertically alined with "Bar-cl.eck" above. 

 5th entry from bottom beginning "Abstract" should be vertically alined 

 with the following 'mt^^y, beginning "Observed". • 



939 2 Vincent hydrophone. Change the preceding page no. from 256 to 265 . 



