Figure 9. — Microammeter (lower left) on console in wheelhouse to indicate angle of stray 

 registered by the telemetering inclinometer shown in Figures 3 and 8 (see Table 1 for 

 source of specifications). "0" indicates the desired 45° wire angle. "200 left" is 5° 

 increase — 50° on inclinometer. "200 right" is 5° decrease — 40° on inclinometer. 



The zeroed meter (lower right) is synchronized with the meter on the deck console 

 (see Fig. 3) enabling the officer on watch to know the amounts of wire out at the same 

 time as the deck force making a net tow. 



2. The flowmeter is read and checked against 

 the recorded initial meter reading — item 14. 

 If there had been a previous tow, this should 

 have been the final meter reading — item 13 

 on the previous tow sheet. If the reading 

 changed between tows, the last recording is 

 crossed out, the new reading entered, and 

 an explanation given in the Remarks sec- 

 tion, lower right hand part of the data 

 sheet. 



3. The 100-lb. weight is lowered about 10 to 

 15 m below the surface of the water. If 

 the ship is still slightly underway, the wire 

 is pulled to the side of the bucket and fast- 

 ened close with snap hook attached to the 

 outside of the bucket (Fig. 12). 



4. The bridle clamp (Fig. 12)— see Table 1 

 for source of supply — is fastened tightly to 

 towing wire, and a safety chain or line 

 (Fig. 12) is fastened to the wire above the 

 clamp. The clamp should be about 15 to 

 20 m above the weight, less in shallow water 



(see Depth-of-Tow graph — Fig. 11 — for 

 directions concerning weight in shallow 

 tows) . 



5. The inclinometer is fastened to the wire 

 above the clamp. Enough slack is left on 

 the line to the inclinometer so that when 

 the proper angle is achieved during tow 

 (Fig. 3), it will not ride up on the cable 

 to hit the block. (If the survey is for net 

 tows only, the inclinometer may be left 

 "permanently" on the tow wire. It is al- 

 ways removed if a hydrographic cast has 

 to be made with the cable.) 



6. The cable clamp is lowered to the sea sur- 

 face, and the winch meter is zeroed. 



7. The ship is set underway, wind off the bow 

 on the side on which the tow is taken., and 

 the signal to start the tow is given from the 

 bridge. The block or pin, which keeps the 

 blades from revolving between tows, is re- 

 moved from the meter (s), and the net(s) 

 is thrown into the water (Fig. 13). (Some 



11 



