HDTenEightyP/NetNews huggingface dataset:
From: fgz@brush.pa.dec.com (Federico Genoese-Zerbi)
Subject: Re: Nitrox (Was Re: Thermodynamic Decompression)
Reply-To: fgz@brush.pa.dec.com (Federico Genoese-Zerbi)
Organization: Digital Equipment Corporation
Date: Wed, 9 Sep 92 16:42:49 GMT

In article <10666@sun13.scri.fsu.edu>, mayne@ds1.scri.fsu.edu (Bill
Mayne) writes:
> Lines: 66
> 
> In article <pk2a69g@twilight.wpd.sgi.com> story@sgi.com (David (Duis)
Story) writes:
> >Could you elaborate?  Why will the partial pressure of O2 affect the
> >on and off-gassing of N2 save by reducing the ambient pressure of N2?
> My understanding of the reasons for this is limited. I've read that
> up to a point increased partial pressure of O_2 makes it easier for
 
> Bill Mayne
> 

Breathing O2 at higher pp causes vasoconstriction, which
leads to slowed offgassing.

A couple of papers I've read suggest that some form of
heliox may be most effective during decompression stops
for reaching maximum offgassing.

F.
Newsgroups: rec.scuba
From: barker@saipan.wri.com (Harold Barker)
Subject: Re: Damage to Kauai???
Organization: Wolfram Research, Inc.
Date: Mon, 14 Sep 1992 23:14:17 GMT

In article <1992Sep14.174727.29438@nrtpa038.bnr.ca> Schoenling writes:
> Judging from the pictures on the U.S. television networks, and
> places I recognized from my own trip to Kaui, Iniki made a real
> mess of things.  Places that weren't outright blown away will
> not have basic services for a while, and I doubt it will be cleared
> up by Oct. 9.  The other(more southern) islands appear to have

I would agree with this.  I have talked to people that have famaly on  
Kaui, they have only heard from 1 of three famaly groups (as of 5:00pm  
09/14/92).  The famaly members that went to Oahu have been in contact, adn  
say that Oahu is more or less ok. 

> been completely undamaged so I would switch my vacation to 
> one of the other islands(Oahu, Maui, the Big Island) if I was you.  
> I've heard good things about Maui and Molokini diving, but haven't
> been there myself so can't say much.

I have been diving with Molokini on one occasion, it was ok.  Crew was  
more interested in talking among themselves about the fishing od the last  
weekend.  I would skip Maui and go for the Big Island.  I have been diving  
with two shops on the Big Island (kona side), King Kamehameha(sp) and Big  
Island divers.  Both good.  I liked the King Kam. night dives best.

> 
> R. Schoenling
> Internet:dtracy@bnr.ca
> Raleigh, North Carolina

--
Work            voice   217-398-0700  |   Home
barker@wri.com  fax     217-398-0747  |   barker@rhiannon.wri.com
NeXT Mail accepted                    |   NeXT Mail accepted
--------------------------------------|----------------------------------- 
barker@rhiannon.wri.com will not be seen at work ;-)
From: robw@tfs.com (Rob Woerner)
Subject: Delphis as carry-on
Organization: TRW Financial Systems
Distribution: usa
Date: Wed, 9 Sep 1992 01:38:23 GMT

Has anyone had any trouble taking a Delphi/Phoenix as carry-on? The 
security folks usually like to see my camera work, but I can't
turn my computer on for them.

Of course, this question applies to any computer that you can't turn
on at the gate.

Thanks.
Newsgroups: rec.scuba
From: miani@ibm7.uucp (Rich Miani)
Subject: REQ: Myrtle Beach diving recommendations
Organization: NYNEX S&T
Date: Tue, 8 Sep 92 14:02:31 GMT

Hi folks,

Anybody care to recommend a dive shop/dive sites erc. in Myrtle Beach ?

Thanks,
Rich

Newsgroups: rec.scuba
From: scairns@is.morgan.com (Scott Cairns)
Subject: Planes, Tanks & Automobiles
Organization: Morgan Stanley - IS
Date: Tue, 8 Sep 1992 16:32:43 GMT


Okay, well maybe not Automobiles but definitely the first two.

I would've thought this is a FAQ but didn't see it in my copy dated
July 15, '92.

My brother-in-law and sister own scuba tanks (don't know what kind)
and will be joining my wife and I on a you-sail-it / you-dive-it charter
in the British Virgin Islands.  Since we'll be doing a lot of our
own diving, they figured they'd just bring their tanks along and get
fills along the way.

I tried to explain to them that this was not a good idea, for the
convienence factor alone, but that I was pretty sure the airlines
wouldn't even let them bring them on the plane or check them through.  
Unfortunately, I didn't have a lot to back my statement up.

Can someone give me the real reasons why?

-- 
+------------------------------------------------------------------+
| Scott Cairns           	|   email: scairns@fsg.com         |
| Fusion Systems Group		|      or: scairns@is.morgan.com   |
| New York, New York, USA   	|                                  |
+------------------------------------------------------------------+
| Standard disclaimers apply.   				   | 
+------------------------------------------------------------------+
| Better not take a dog on the space shuttle, because if he sticks |
| his head out the window coming home, his face might burn up.     |
|    					- Jack Handey		   |
+------------------------------------------------------------------+
Newsgroups: rec.scuba
From: pyron@skndiv.dseg.ti.com (Dillon Pyron)
Subject: Re: Undercurrent Newsletter
Reply-To: pyron@skndiv.dseg.ti.com
Organization: TI/DSEG VAX Support
Date: Tue, 15 Sep 1992 22:33:05 GMT


In article <psshrbk@fido.asd.sgi.com>, leej@sgi.com (Lee Jones) writes:
>In article <1992Sep15.170722.19069@odin.corp.sgi.com> rene@cvette.asd.sgi.com (Rene St. Pierre) writes:
>>I have been solicited to suscribe to Undercurrents Newsletter and Rondale's
>>Scuba Diving mag. Are these publications worth the investment? All opinions
>>are appreciated.
>
>Short answer: Undercurrent (no 's') is excellent non-biased reporting.  
>  If you do dive travel, it's invaluable.  
>
Not only are the travel article good, but they are also providing a more
rounded source for advanced dive information.  Their series on video, for
instance, or the fact that they publish recall notices months before anyone
else!  And, morbid though it is, _How Divers Die_.  On the other hand, most of
the travel articles of late have been to the South Pacific or SEA.  Now I want
to spend big chunks of bucks!
--
Dillon Pyron                      | The opinions expressed are those of the
TI/DSEG Lewisville VAX Support    | sender unless otherwise stated.
(214)462-3556 (when I'm here)     |
(214)492-4656 (when I'm home)     |"Do something different, DISAPPEAR"
pyron@skndiv.dseg.ti.com          |  "DISAPPEAR"
                                     _A Day On Earth_
                                     Brave Combo

Newsgroups: rec.scuba
From: mac@bnr.ca (Michael Campbell)
Subject: Re: Flower Gardens Banks Trag
Organization: Bell-Northern Research, Richardson, Tx.
Date: Tue, 08 Sep 1992 17:42:18 GMT

TO: Mike Meyer

Mike, I will let you know.  If you have been reading  this group,
you will know that the only new hard news that has  surfaced  (no
pun  intented) is that the  incident  occured  from the dive boat
Miss Vicky.

I recently  completed a 3 day trip to Flower  Gardens and Stetson
Bank, aboard the mv Fling.  The diving was great (3 whale  sharks
and multiple  manta rays at Flower  Gardens),  the water was warm
(82 degrees at 75 ft) and visibility was decent (70-80 ft).

To other  readers  of the group, I agree the DCS seems an unlikey
probability for the recent fatality.  At Flower Gardens, we never
managed to get much deeper than 85 feet.  It is possible that the
diver in question simply repeatedly blew the tables until DCS did
him in.  I noted a lot of other  divers  on the  Fling  that were
using  both 100 cubic foot tanks AND pony  bottles,  to  maximize
their  bottom  time - with this kind of  arrangement,  their  air
supply would easily  allow them to blow the tables, if they chose
to.

I was *VERY*  impressed  with the  operation  on the Fling.  They
were  very  safety  conscious,  and  were  always   inobtrusively
checking that each team knew what they were doing.  As well, upon
surfacing,  you  always  had to log your  maximum  depth and your
bottom time with the crew.  If you had a computer,  they  checked
it as well.  To achieve DCS via the mechanism outlined above, you
would have to blow the tables AND lie about your bottom  time, if
you were  diving off of the Fling.  On night  dives, they went to
extra lengths to ensure that you did not wander off from the boat
and get  lost  (they  hung  strobes  at  Flower  Gardens,  and at
Stetson,  were the vis was a bit  lower,  they sent a  divemaster
down ahead of the divers, and secured  multiple  strobes, as well
as cylumes  at various  places, so that you could  fairly  easily
figure out where you were).

I would  recommend  the Fling - our  group is  already  booking a
return  engagement for next year.  Conditions are a bit primitive
from a comfort and privacy point of view, but on balance, they do
a super job.

========================================================================
Michael Campbell                  BNR Inc.               Richardson, Tx.
ESN   444-5595                   Dept 2Q35                 75082-4399
(214) 684-5595 
Newsgroups: rec.scuba
From: gregr@joyce.cs.su.oz.au (Greg Ryan)
Subject: DIN valves on Faber 7l tanks
Reply-To: gregr@cs.su.oz.au (Greg Ryan)
Organization: Basser Dept of Computer Science, University of Sydney, Australia
Date: Wed, 9 Sep 1992 01:17:51 GMT

Someone in the UK might best be able to help me with this one.
I've arranged for a friend in the UK to get me a pair of the Faber 7l
steel 232 bar tanks which he is going to bring out to Australia when
he emigrates.  He ordered them with DIN, and then mailed me to say
after seeing the tanks in a warehouse...

"The DIN valves may cause problems: they are apparantly convertable between 
DIN and the standard type (what's it called?) but I dont quite see how. they 
tell me you unscrew the valve with an allen key (No 3 or 3A) and then DIN 
fitting appears."

I can't quite imagine what these valves are like.  Does anyone have
any experience with this sort of tank and valve?  If so, perhaps you
could mail me an explanation.

				Greg Ryan	gregr@cs.su.oz.au
From: hack@arabia.uucp (Edmund Hack)
Newsgroups: rec.scuba
Subject: Re: Need Nikonos service info
Keywords: nikonos
Date: 15 Sep 1992 21:29:06 GMT
Organization: Lockheed ESC, Houston

In article <1992Sep11.230304.7912@u.washington.edu> wolgamot@milton.u.washington.edu (Greg Wolgamot) writes:
>As for Nikonos service, I was told by my dive instructor/shop owner that
>my camera would have a better chance of leaking after being service than
>before.  

Maybe he wants to sell you a new one. :-).  As for it being more
susceptable to leaking after service, that is a new one on me.

>So, I haven't sent my Nikonos V in for the annual service ever,
>which has been about 5 years.  It probably has 100 saltwater dives on it,
>and has never leaked.

This is like saying, "I've never been in an accident, so I don't need car
insurance."

>	I don't know if my policy of no service is good, 

Probably not, if what I have been told by some pro photographers is
true.

>but I do know that
>a few years ago I was quoted a price of $76 plus postage to have all of the
>internal O rings inspected and regreaseed.  For this price, I could afford
>to have a camera flood and buy a new one every few years!

About every 6 years.  I look at it as insurance. I'm going on an
expensive vacation and taking pictures that I enjoy a lot. I'm willing
to spend $75 (less than 50% of what I will spend on slide film and
developing) to be assured that the camera is in good working order and
that the o-rings are not about to give out. It is a small investment
with a reasonable payback. (Look at the cost of renting a Nikonos at
most resorts if yours floods....)

However, if you buy a few tools (screwdrivers and a couple of other
things) it is not hard to take the N.V apart and service the o-rings
yourself. I've done it as part of an UW photo course. You will need a
supply of o-rings in case any need replacement.

-- 
    Edmund Hack - Lockheed Engineering & Sciences Co. - Houston, TX
  hack@aio.jsc.nasa.gov - I speak only for myself, unless blah, blah..
   Papoon for President - You Know He's Not Insane! - Endorsed by the
  American Friends of the Martian Space Party, League of Winged Voters
From: jstrom@hpcc01.corp.hp.com (Johan Strombom)
Date: Mon, 7 Sep 1992 09:02:43 GMT
Subject: Re: mask strap
Organization: the HP Corporate notes server
Newsgroups: rec.scuba

/ hpcc01:rec.scuba / saitowit@underdog.ee.wits.ac.za (SAITOWITZ L S) /  1:52 am  Sep  3, 1992 /
>Are there any safety reasons for diving with a mask strap? I'm quite new to 
>diving, but find the strap and snorkel quite a bother. Is it unsafe to dive 
>with the snorkel say under your knife strap on your leg and to just clip 
>your mask to your BC when on the surface?

No, it's not a safety problem. It probably has to with the way you were taught.
I have noticed that U.S. trained divers (PADI,NAUI,YMCA) tend to dive with the
snorkel in the mask strap whereas CMAS, BSAC trained divers tend to dive with
the snorkel under there knife strap, and then inserting it under the mask strap
while at the surface.

>
>P.S. Are there such things as contact lenses that are calibrated for the 
>refractive index of water?  

Yes, Jaques Mayol (famous record setting free diver) dives with special contact
lenses to avoid mask squeeze. They are custom manufactured by an optician
in Marseilles. They are very expensive US$ 1000.- + a pair.

Johan, CMAS M1F 1323
From: story@sgi.com (David (Duis) Story)
Newsgroups: rec.scuba
Subject: Re: How about the Oceanic Datamax?
Date: 9 Sep 92 00:01:50 GMT
Organization: Silicon Graphics, Inc.

In article <24160@oasys.dt.navy.mil> cervi@oasys.dt.navy.mil (Mark Cervi) writes:
>In article <1661@radius.com> brad.radius.com (brad may) writes:
>>To summarize, whereas I stayed higher than my buddy the 
>>whole dive except for the amberjack excursion (and to wait 
>>out deco stops), he was never very close to his no-deco 
>>limit and I had *40 minutes* of deco time.  Apperently no 
>>one else went into decompression, in spite of several people 
>>being well below my max. depth.
>>
>>bmay@radius.com (Brad May)
>
>The dive models should not be that much different.

But they are, and running the two through some simulations does a lot
to show what's going on.  Of course, the special "tweaks" that Lewis
added to penalize deep diving make the model almost a non-issue in
this particular "deep" diving circumstance.  The bottom line is that
the "models" are very different.

>I would advise you to get the Data Max Sport calibrated, and to
>use the dive tables as a secondary (backup) system in any case.

Could you please explain to me how to use the RDP as a backup when it
is possible to use the computer to do both single and repetitive dives
which do not fit on the RDP, and the RDP does not allow decompression
diving?

>I used a DataMax Sport for about two years, and when the batteries started
>getting low, it started giving depth readings that were wrong.  Of course
>this screws up the decompression calculations, and the whole thing is 
>no good until the batteries are replaced.  Oceanic replaced them for 
>free.

Wow, this is really scary!  How did you figure out that the depth
readings were wrong?  Were they drastically wrong, or just
progressively more off?  Shallow or deep, or random?  Anyone else have
these problems?

Cheers,

David Story                        NAUI AI Z9588, PADI DM 43922, EMT
story@bent.wpd.sgi.com		  Better diving through computers.
Newsgroups: rec.scuba
From: spindler@rcf.rsmas.miami.edu
Subject: Re: mask strap
Reply-To: spindler@rcf.rsmas.miami.edu
Organization: RSMAS
Date: Thu, 10 Sep 92 15:32:19 GMT

In article <keulen.716090969@possum>, keulen@possum.csu.murdoch.edu.au 
(Mike van Keulen) writes:

>Wouldn't such lenses cause eyeball squeeze - the pressure difference would be
>more localized certainly, but at depth could cause a problem, couldn't it?

If they are anything like standard contact lenses, they float on a thin film of
fluid surrounding the eyeball.  There is no airspace between the lens and the
eye, and hence there is virtually no pressure differential when diving, as the
fluid and the lens are for all intents and purposes incompressible.  

The big difference is in the thickness of the lens, as the refractive index
ratio between plastic and water is much less than plastic and air, hence the
correction for underwater vision would require a fairly thick lens.  I wonder
how comfortable such a lens could be?  

This brings an interesting question to mind:  Dolphin vision is good both above
and below the surface.  Does anyone know how they manage this?

----
Todd Spindler                                  
TSpindler@rsmas.miami.edu                 RSMAS/MPO  University of Miami
From: story@sgi.com (David (Duis) Story)
Newsgroups: rec.scuba
Subject: Re: US Divers equipment and Nitrox
Date: 9 Sep 92 00:47:46 GMT
Organization: Silicon Graphics, Inc.

In article <1992Sep8.000642.19548@cs.su.oz.au> gregr@cs.su.oz.au (Greg Ryan) writes:
>At a US Divers Technical Workshop held in Sydney a little while back, 
>Paul Leszczynski, a Senior Technical Advisor from US Divers, said that 
>US Divers equipment is not compatible with nitrox.  I thought I'd pass
>this on to the net as this was the first statement I had heard about 
>nitrox compatability from US Divers.  Oceanic, Poseidon and T.D. Preece
>(an Australian company which makes the Command Air reg and Sea Hornet
>valves) are the only companies I have heard state that their equipment
>is nitrox compatible.
>
>				Greg Ryan	gregr@cs.su.oz.au

USD and Sherwood are the only two US mfr's to state that their normal
gear is not nitrox-compatible.  

As an informational aside, the latest UnderCurrent reports that NOAA
does NO tank or reg cleaning when switching from air to Enriched Air
of up to 50% O2, and has had NO problems whatsoever.  In addition, a
10-year study of Enriched Air's effect on SCUBA equipment has shown NO
deleterious effects whatsoever.  This with less than 50% (possibly
40%, my memory fails me) O2 contents.

Cheers,

David Story                        NAUI AI Z9588, PADI DM 43922, EMT
story@bent.wpd.sgi.com		   Oxygen is a drug in California.
Newsgroups: rec.scuba
From: Duane Clark
Subject: Re: Catalina: information wanted
Reply-To: duane@hither.jpl.nasa.gov
Organization: Jet Propulsion Labs
Date: Sat, 5 Sep 1992 20:44:23 GMT

In article <12212@cis.rand.org> schutz@rand.ORG (Karl Schutz) writes:
>
>It seems like I have dove Catalina at least a gazillion times ... 
>
>The result of all this diving is that some of the sites that used to be great
20
>years ago (when I started diving) are pretty much trashed.  However, there are
>still some really good sites left.  They are the ones beyond the skills of
most
>beginning divers.  So, if you want to hit those spots, don't ride a boat with
a
>lot of students (or better yet, any students) on it.

I'd have to take exception to this.  I guess this would depend on what you
think
it takes to make a great site. If you are only interested in BIG fish and bugs,
then this is true. But for photography, sightseeing, and just plain nice
diving,
it certainly is not.

One of the advantages CA diving has is that the sites are not particulary 
fragile.  The terrain consists mostly of rocks, kelp, stubby hard corals, and
gorgonias. Primarily it's the gorgonias that are fragile. Kelp grows so fast
that all the students in the world could dive here with no affect. The only 
thing that hurts it is warm water (such as we have been having lately from the
El Nino).

I also dive Catalina a lot. Just a few days ago, I dove Bird Rock and Emerald
Bay, two sites heavily dove by students. I saw a sea lion, a bat ray, numerous
morays, bugs, abalone, scallops, thousands of the ever present blue perch, 
hundreds of several kinds of gobies, many of the ubiquitous, bold garibaldi,
thousands of jack mackeral swimming in flashing schools, barracuda, calico
bass, kelp fish, rockfish ...
And of course the famous and absolutely wonderful kelp forests. Pretty typical
for Catalina.
From: zwbm07@hou.amoco.com (Walter Moore)
Subject: Re: Flower Gardens Banks
Reply-To: zwbm07@hou.amoco.com
Organization: Amoco
Date: Thu, 10 Sep 1992 12:41:54 GMT

In article 72221@apple.Apple.COM, mike@Apple.COM (Michael Lee) writes:
>
>Being new to Texas I have heard a little about the Flower Gardens.  I would
>like to make a trip out there but am not sure what dive boats are the best for
>multi day trips and for diving in general.  In fact, where do they leave from?

Freeport and Galveston, depending on boat. Sea-Tex Boats goes from Gavleston. 
I've used these guys and would not recommend them. The company that runs the
Fling goes from Freeport. They are supposed to be a top-notch company, but since
I haven't gone out with them, I can't say. The Gulf tends to be choppy. I understand
it's a 10-12 hour boat ride to the Flower Gardens, the diving is supposed to
be nice there.

>Any information about the Flower Gardens and dive trips to them would be
>greatly appreciated.
I'm not sure which of these shops are running trips, but you can usually get on
one when another is shop's trip is full.
Ken Lee's West        (713) 784-1173
Sea Sports Scuba      (713) 894-4488 (this is one of their shops, there are 3)
Pro Scuba             (713) 783-3483
Dive Tech             (713) 973-2946
Houston Scuba Academy (713) 497-7651
Southwest Scuba       (713) 498-3483

The Deep              (409) 765-9746  (In Galveston - uses Sea-Tex)

>
>I would also like to know if anyone has any suggestions for spear fishing trips
>from the TX coast.  Some of the dive shops around here say that I am looking
>for an oil rig dive but cannot tell me much about getting on any trip to do
>this.

Yep, that's what you want, talk to the same shops above.


---
TTYL & TANSTAAFL ---------------- Walter Moore 
      Internet: zwbm07@hou.amoco.com

..SCUBA divers do it with depth...blub...blub...blub...
From: geary%cfa3.DECNET@CFA.HARVARD.EDU
Newsgroups: rec.scuba
Subject: Bonaire Holiday Trip
Date: 8 Sep 92 20:54:22 GMT

Is anyone out there interested in a two-week trip to Bonaire over
the holidays?  I am looking for two couples or a small family to
take over my reservation for a two-bedroom apartment with full
kitchen at the Carib Inn for the period Sat., 19 Dec. to Sun., 3
Jan (15 days).  Come experience some of the best and least expensive
diving in all the Caribbean.

John Geary, DM-52283
geary@cfa.harvard.edu
(617) 495-7431
FAX      -7490
From: ray@tsw.UUCP (Ray Izumi)
Newsgroups: rec.scuba
Subject: test only
Keywords: test
Date: 8 Sep 92 23:07:22 GMT
Organization: The System Works, Redmond, WA

ignore me
-- 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Ray Izumi, The System Works, Redmond, WA     206-823-4685      uunet!tsw!ray
"No amount of not finding something proves it doesn't exist."
Newsgroups: rec.scuba