The Streamlined Nose-Piece 



The wooden nose-piece was designed to protect and direct a balanced 

 flow of seawater on the end cap, which houses the sensing elements when 

 the telemeter was being towed through the water with the sensing elements 

 facing forward. This nose-piece houses the seawater sxvitch, which is a 1/4- 

 inch O.D. lucite rod with a heavy brass slug where the insulated wire 

 from the battery relay is attached. The electrical circuit i3 completed 

 whenever water completes the circuit between the brass slug and the metal 

 telemeter housing. The exposed end of the relay wire is coated with 

 either rubber cement or 3^ Scotch Fill. 



Fittings 



(a) The transducer mount is constructed of l/4- by l-l/2-inch 

 brass rectangular stock. It is a two-piece band with brass spacer blocks 

 to carry the supporting arms, which hold the type QBG transducer. The 

 directional adjustment is approximately -15° to +45° for the axis of the 

 transducer. 



(b) The hangers are also constructed of l/4- by l-l/2-inch 

 brass rectangular stock, and both are one-piece-type clamp bands. One 

 hanger has a single mounting arm and shackle, and the other hanger has 

 two mounting arms and shackles placed diametrically opposite each other, 



(c) The three-fin tail assembly is constructed of l/4- by 

 l/4-inch brass rectangular stock framework with 0.017-inch sheet brass. 

 These three fins are mounted on a two-piece band (l/8- by 1-inch brass 

 rectangular stock) forward, and are held fi roily aft to the telemter 

 case with a band (l/l6- by 1-inch brass rectangular stock) encircling 

 the circumference of the fins and anchored at the three points on the 

 telemeter case. 



This arrangement will allow a nurrber of mounting possibilities: 



(1) Towing with fins and a bridle. 



(2) Towing with fins, bridle, floatation equipment, 



and ballast on other hanger. 



(3) Attached to trawl cable with both hangers. 



(4) Fount ed on trawl wings with both hangers. 



(5) Mounted in the mouth of trawl net with both hanfers. 



14 



