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MISCELLANEOUS 



9614 



9614. Velocity Reduction Factors for R.A.R. 



Hydrographic surveys controlled by Radio Acoustic Ranging (R.A.R.) are plotted 

 on smooth sheets by using an assumed velocity of sound of 1,460 meters per second. 

 This velocity was chosen so that the corrections to the elapsed times to account for the 

 actual velocity will always be positive. (See 7341 and 7631.) Table 36 gives the fac- 

 tors by which the actual elapsed times may be multiplied to find the times to be used 

 in plotting on smooth sheets on which the distance circles have been drawn for an 

 assumed velocity of sound of 1,460 meters per second. 



Table 36. — Velocity reduction factors for R.A.R. 

 [Factors for reducing elapsed time at actual velocity to corrected time at velocity of 1,460 meters per second.] 



465382 — 44- 



