__^^-4A 4| 3 ^ 42. 



AS 44 4i 42 



5Z 51 oo 49 46 4.7 46 



KiG. ».— A chart for use with the sonic depth apparatus showing the vilncily ot siniinl in llu' wnlcr loliinin around the Grand Bank 



32030—27. (Face p. 4'J.) 



