WET SUITS 



289 



9. Compute a new L for each x'. 



10. Print-out n, e , x', L'. 



This procedure was programmed on a Burroughs ElOl computer to reduce the computation 

 time from several days to about a half hour. Preliminary computations indicated that alloys 

 having higher specific resistivities than copper would have to be employed. Stranded wire in 

 small diameters and special alloys is not commercially available. Therefore, it became prac- 

 tical to attempt to use only one type of wire throughout the suit. The selection was "Advance" 

 wire which, in B&S gage 33 (7 strands of B&S gate 42), has a resistivity of 0.486 ohm per inch. 

 "Advance" wire alloy consists of 43 percent nickel and 57 percent copper. It has a nominal 

 specific resistance of 294 ohms per circular mil-foot at 68° F and a specific heat very close to 

 that of copper. "Advance" was chosen over the nickel-chromium-iron alloys because it can be 

 soft- soldered with as much ease as copper. 



Table 41 shows the print-out design information corresponding to the general configurations 

 shown in Fig. 111. Departures from the configuration were made near seams and gussets. 



Table 41 



RESISTANCE WIRE CIRCUITRY 



( p= 0.486 ohms/inch, x' = 0.375 in.) 



Fig. 111. Electrically heated wet 

 suit — general resistance wire con- 

 figuration 



