TANNER DREDGING OPERATIONS OF SPEEDWELL IN 1879. 615 



Tb e following abbreviations are used in tbe foregoing report and tables : 



+. Dredge. Used on the chart. 



Trawl. Used on the chart. 



Lt. Light, or light-house. 



Pt. Point. 



H. TV. High water. 



L. TV. Low water. 



°. Over figures — degrees. 



'. Over figures — geographical, or sea miles. 



Abbreviations of bottoms. 



M., or m., for mud. 

 S., for sand. 

 G-., for gravel. 

 Sh., for shells. 

 P., for pebbles. 

 Sp., for specks. 

 St., for stones. 

 P., for rock. 

 O., for ooze. 



bk., for black, 

 wh., for white, 

 yl., or y., for yellow. 

 gJ-j or g-> for gray, 

 bu., or b., for blue, 

 gn., for green, 

 br., for brown. 



fne., or f., for fine, 

 crs., for coarse, 

 brk., for broken. 



The following examples will illustrate the use of the abbreviations of 

 bottoms : crs. yl. s. bk. sp. brk. sh. — coarse yellow sand, with black specks 

 and broken shells. Bu. in., or b. in., blue mud. 

 Very respectfully, your obedient servant, 



Z. L. TANNER, 

 Lieutenant, Commanding. 



