34 
Direction Scaling Template 
MANUAL OF CURRENT OBSERVATIONS 
YD DY DY VDT WZ Diz Sta. 31 
a at a nO eG 
Sec. 0 1 2 3 4 5 6 7 8 9.10 (0730 
Showing Method of Computing Velocity. 
V-Interval =6.6/10=0.66 Sec. 
Vel=6.0 Knot 
Dir= 90° Mag. (approx.) (scaled) 
Vv DV Bisection V DV Sta. 31 
oo _,—__——_+- T T ae Ep 3 1 —_ 3-13-46 
Sec. 0 1 2 3 4 5 6 7 8 9 10 1200 
Showing bisection to Indicate position of 
obscured V-mark when signals overlap. 
V-Interval=3.1 Sec. (by Inspection) 
Vel=1.3 Knot 
Dir= 10° Mag. (scaled) 
TAPE SCALING 
Radio Current Survey 
Radio Current Survey 
Ny 
ox 
Se} 
° 
= 
N 
Sy 
Qa 
EATEN 
7/1 TNC iy Se ee 
PART | 
Showing Method of Scaling Direction with 
Celluloid Scale. 
V-Interval = 4.5 Sec. (by Inspection) 
Vel =0.9 Knot 
Dir. =245° Mag. (scaled) 
FIGURE 24.—Tape scaling, radio current meter. 
