142 APPENDIX B 



Wick electrode mount 



Bind 



k. 



";^ 



(0 



^^Bi 



Front view 



End view 





•i 



As shown on the diagram, heavy cotton 

 thread extending through a tapering glass pipet 

 (a) filled with sea water provides a convenient 

 wick. The pipet is fastened with small fuse clips 

 to a small piece of lucite (b) (2" X 1" X i"), 

 which is mounted on the large lucite base (c) 

 (3" X 6" X f") with heavy stopcock grease. 

 The pipet is thereby readily movable with regard 

 to the base and can be positioned in any desired 

 direction. A silver-silver chloride wire runs 

 through the pipet and attaches to a binding post 

 screwed into the top of the base. The rear end 



of the pipet is sealed off with a rubber cap, pre- 

 venting the pipet from drying out rapidly. 

 When not in use, the wick end of the pipet 

 should be immersed in sea water. 



We have not found it necessary to shield the 

 input cables for these experiments; but when 

 using the exposed wick electrodes, a copper 

 shielding cage is necessary to enclose the prepa- 

 ration. We have attached standard banana 

 plugs on all our leads for convenience in con- 

 necting the instruments both to nerve chambers 

 and electrodes. 



