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On Sat, 2 Dec 1995, Robert Robbins wrote:


> I like the mask but, as with all full face masks, I don't think they are as
> safe to use in freezing conditions as a conventional second stage.  I want to
> be able to switch to my redundant breathing system in a hurry and without
> losing my vision.

...and without the cold water face-slam+water-gulp....I belive you mentioned 
the neoprene "ice caps" before--they help me avoid the i-scream headache in a 
mask bailing situation.

Now, some more questions:


What do you think about the adjustable 2nd stage knobs 
(ala scubapro dial-a-death or the different exo design) as a 
way to start/stop/slow a 2nd stage freeze-up?

Have you ever manifolded redundent open circuit rigs(with say a ball valve 
switch and/or double-end-shut-off quick disconnects) to the ffm as found on 
bail-out rigs for surface supply?

do you have an opinion on the over-pressure relief valves used on a 
bail-out block (particularly regarding the lube/oring/entrapped 
freshwater)? 

Thanks,

EM




_____________________________________________________________.sig
Eric Maiken                    email: eapg243@ea*.oa*.uc*.ed*              
Dept. of Physics                   o: 714 824-6621   
U of California                  fax: 714 824  2175
Irvine, CA 92715-4575

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