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APPENDIX IV 
GASKETS AND STUFFING BOXES FOR CAMMRA CASES 
We have found that gasket and stuffing box design for our camera cases is not very 
critical. No special effort is made to achieve very close tolerances on gasket surfaces. 
However, whenever practical we put the gasket in a tongue and groove type of joint. The 
only gasket failures we have had have been due to static and not dynamic pressure. At a 
depth of 600 feet, for example, we found that we could not use our ordinary 1/8 to 1/16 inch 
rubber gasket because it squeezed out. Thin Vellumoid was found satisfactory in this instance. 
We have used two types of stuffing boxes for electrical leads with equal success. In 
the first type (see Fig. 141) the rire cable led through a hole in the case vhich was packed 
with compressed rubber, In the second type (Fig. 142), an insulated metal jack was put 
through the case and electrical connections were made on both sides of the jack. The second 
method is perhaps preferable in deep water because there is no chance of water leaking into 
the case through a hole in the cable insulation. 
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