LOWERING WIRE 



DIRECTION 210" 



Figure E-12. Subsurface wire angle indicator (designed by Dr. J. N. Carruthers.) 



Meter Wheel Reading Doitm column. Calcu- 

 late this value in the same manner as though 

 the wire angle indicator was a Nansen bottle 

 (seepar. E-2). 



AVlien the cast is being lowered, stop the 

 winch when the counter dials indicate the down 

 meter wheel reading for the WAI, and attach 

 the device to the wire as follows: 



Step 1. Snap the safety line clip to rod (A) 

 on the indicator, and engage the oceanographic 

 wire in wire groove (B) at the bottom of the 

 indicator. 



Step 2. Then engage the oceanographic wire 

 in upper wire slot (C) and wire clamp (D) 

 and tighten the thumb screw (E') until the WAI 

 is secured to the oceanographic wire. 



Step 3. Unclip the safety snap and hook to 

 tlie oceanographic wire below the indicator. 



Step 4. Place a messenger with wire and 

 loop on the lowering cable below the indicator 

 and connect the loop of the wire to the messen- 

 ger release mechanism (F) by pressing down on 

 the tripping mechanism (G). 



Step 5. Cock the indicator mechanism by 

 lifting spring plunger (H) with fingers and 

 engaging trigger (I). 



Step 6. The WAI is now set to operate. Re- 

 move the safety clip from the lowering wire, 

 and lower the indicator into the water. 



E-8 Retrieving the Wire Angle Indicator. — 



Keep a sharp lookout for the subsurface wire 



E-10 



