Gr, A on Ge

Newsletter 67.
Oct. 2000.

Includes "First Aid for Cavers"

A Blast From The Past - August 1979

Maskhill-Ozxlow-Giants: Tony Gamble and Tony Reynolds

Descended Maskhill at 1030 am using 200' of rope for the first 2 pitches, 300! for the 3%,4*
and 5* and 150' for the 6 (waterfall) pitch. (This would have been I !mm - probably "Blue
Water” -Ed)) Straight forward trip through Maskhill except on 6* pitch where Tony R. had to
descend about 90° and swing across about 15° into Oxlow West Chamber. We left our
prussiking gear in an ammo tin and set off through West Chamber to the 40' ladder into
Pilgrims Way and on to The Connection

The first squeeze was very tight as the passage had silted up, some of this was removed before
the retum. Now to test Tony R's string wet suit. (ie full of holes! -Ed.) A fairly quick crawl
until we came to the water, only 2" air space. This was passed with three short dives. T.R. had
to taste the stuff-like thin mud, Another 100" and out into Poached Egg Passage-relief. There's
no need for ventilation in elbows and knees!

On to Geology and East Canal. That's half of it, now we've got to get back. With TR. still
trying to warm up we set off back for the connection, the thought of that water didn't help, it's
cold. On through the connection and along Pilgrims Way through West Chamber. Next Mars
bars then up Waterfall Pitch. Packed my gear mto ammo then dropped it back down again!

After getting my gear out we made our way out as quickly as possible Trouble geting gear
up the 3" pitch. When I got out it was dark (surprise, surprise! -Ed_) so had to rush down to

the car and tum my lights on then go back to help haul gear up the entrance shaft. By now it
was 10.30 p.m. We had to make a quick change to get a pint before closing.

10% hours caving. [f you think it's easy, try it! But don't ask me to go with you.

Tony Gamble

Video Evening
A showing of some of Dave Webb's videos and a meal have been arranged for Sat 30%
September at the "Miners Standard", Winster. Camping is available and (if you are quick
enough) so is accommodation. No doubt some caving will take place during the weekend.

Eldon Hole
‘Thanks must go out to Rob, Steve E., Alan and Mark Smith for removing the animal remains
(2 bags puppies, adult dog and numerous rabbits) from the bottom of Eldon, Particular thanks

must go to Mark who spent a good part of the morning up to his armpits in the remains
resulting in him having to spend the aftemoon in a bath of neat

Detol rather than doing a "round trip" in Giants with the others!! THANK. YoU

Jenny Potts, on behalf of DCA, thanks all those
involved in any way with the work (fencing, stile
building, site clearance, additional fence repairs, etc,
at Eldon Hole

Faney a Curry

Plans are afoot for a group of us to visit NE India in Feb 2001. If you have read the articles in
Descent you will already know that quite a bit has already been discovered with both
horizontal and vertical development akin to typical Yorkshire systems. We would work as a
unit attached to a larger expedition consisting of Hungarians, French, Americans plus any
other groups who "sign up", Someone with local knowledge would be assigned to us to help
locate systems and help with any language difficulties. All meals are provided, transport in
all-terrain vehicles and accommodation is in "guest houses" which if they anything like those
in Pakistan will be basic. Cost (including flight) around £1000.

Interested? Contact Matt or Ralph,

Other suggestions have been- a trip to Russia (Ukraine) in August, this costs about the same
but gives folks longer to save up of, we could be really boring and go to Europe!

Cavers Fair

Personally I felt the tum out was low and could have done with more
‘grass route support, Tom prepared a first aid session he did not have to
Geliver through total lack of cavers, Ralph, assisted by an almost
comatose Matt, (as a result of Kev's party!!) did a day on "ladder and
line" and Nigel was asked at VERY short notice to run the "explosives"
session as Nick Williams was unable to attend. Mark L. attended Dave
Webb's video-making session -hopefully the club will shortly be on TV!

Castleton Street Collection

£106 97 was raise-alniost £100 of it in the "Crewe" session which ended at @.
Tish, Surprisingly Gareth's tin had the most in it- despite giving the FF

appearance of spending the morning chatting up the local talent, Thanks to
those who took part.

Hypothermia Crawl

Mat has made two visits to Hypothermia Crawl on his last one reaching the same point as
Stan Kowalik and Mick Stratford in 1975 which they named "Crewe Junction”. Nothing
seems to have changed- the crawl is still horribly wet and tight (but not for Mat!) and the aven
and boulder choke still need further investigation! It remains an unpopular, rarely visited
location! Stan's original write up follows overleaf,

No sense and good luck at Rowter Hole

Driven to Rowter Hole by vivid visualisation of entering Speedwell Caves from above and
by a "back door’, Mick and myself, in high spirits, equipped with an entrenching tool, luck
and ciggys prepared ourselves for the descent of the main shaft. As we were about to descent
we were accosted by a stranger who called himself Ben an who, by his own description was a
fanatical "digger" belonging to some minor club, Orpheus or the suchlike. After trying to
persuade us that Rowter had no potential, and failing he asked if he might join us, well
anything for a quiet life and so that we could get started we agreed and he dashed off to his
abode (a chicken shack) at the farm to get changed. Meanwhile Mick and myself made our
decent and began making prelim exams around the bottom, as we were going to leave no area
in Rowter untouched, Ben joined us while we were pottering and so we decided to show him
(and allow him to assist) our potential digging place.

Now for all of you that have not yet visited Rowter, on the way to the twin shafts where we
‘were heading, water enters the mine on the left wall at a high level through an extremely tight
narrow bedding plane that in the words of Dave Elliot (Ref: Caves of N. Derbyshire part one)
‘ig easily reached by climbing but becomes too low after a few feet’ which is an
understatement and in the words of Stan Kowalik is bloody impassable wet and
uncomfortable, but this day (I've been to have a look before) we had Ben with us, and I was in
1 posing mood, I climbed up to show him just how tight it was, but because of my mood and
with the help of our spade cum pick I realised that if six inches of calcite floor could be
removed we could gain a two foot extension which would enable me to peer around the 90°
left hand bend the water took, With battery and helmet removed (its that tight) I scraped
away, and after a few minutes managed to effect and opening just large enough for me to
force entry where I was able to see round the bend (no pun) "It goes" came back my excited
little voice "if you struggle" What my eyes beheld was a passage, no a slit roughly the same
cross sectional as a Jap's eye and approximately the same size (actually about six to eight
inches high in the middle, where the eyeball should be) and blocked off in places by fragile
stals, Without thought of how I was going to back off, save finding a passing place I started
to worm my way up, dragging my lamp behind me inch by inch. With lots of grunts and
groans behind me, I imagined Mick was following my lead, as Ben had no wetsuit and the
passage had two inches of water in it, but I was mistaken, Mick had tried and failed to get in,
and Ben being somewhat smaller in diameter and so excited by this find (also because he
‘must have been somewhat of a case) had followed me in. Anyway with a forced draught
blowing in my face and the impossibility of reweating backwards, off I went at my snail's
pace followed ten minutes behind by Ben, whom I could not see. With so much effort forcing
myself up that passage I find it hard to recall an accurate description of total distance covered
but [ imagine (after close collaboration with both Mick and Ben) I must have travelled at least
‘two, perhaps three hindred feet in a westerly direction, which although I would not dare to
suggest, even think is towards Giants! There are also two more 90° bends which, although
like a dog's leg still makes due west, and one extremely tight lump in the floor, which collects
water on the one side of it, and makes avoiding getting your face wet impossible. With the
water on the floor reflecting the light of my cap lamp, it kept giving an illusion that a yard
further would be the start of the passage opening up, so after such illusions all the way along
it was with relief and excitement, when the passage did open up, large enough to stand, then
crawl up a slope and small waterfall into a large cavern decorated with beautiful formations. I
attempted to shout down the passage of the find, but the answer back was unintelligible
indicating that the person following was way back and at least ten minutes away, so I decided
to explore very carefully

This new caver was actually the junction of two passages one left (west) and the other right
(east) the easterly was the one | could hear water cascading so that became the priority, but
disappointingly seemed to end in a calcited boulder choke after a few yards with the water
pouring down from its heights, knowing boulder chokes of old I retreated to leave that for a
second opinion from Mick who I still imagined worming his way up the passage, still a good

®
distance off too by the gurgled moanings, so I had a look up the westerly passage. Its extent
is perhaps ten yards with all interesting bits in it, including a solid wall of mud that indicated
that at least the place was never entirely submerged in recent times, even in flood. From what
appeared the limit of this cavern, by facing back down and locking up, a climbable aven was
‘observed and a large proportion of the draught [had felt in the passage. Assuming my partner
must be close I went back to the start or ending of the passage to give vocal assistance to the
crawler. I was really taken aback when Ben showed his face two minutes later, he had taken
on a deathly pallor and was obviously starting to suffer from exposure, teeth chattering and
spasms of shivers that visibly rocked him from side to side, his "tee" shirt was upped from his
back caused by the bits of stal that had taken lumps out of the back of my wetsuit. It was
plain to see, and he knew himself that he'd never get down the way he'd come so the only
hope was my wetsuit. I knew if he got warm he might make it so he donned on my jacket and
within minutes the change that came over him was incredibly swift, in fact I thought just a
ruse to obtain my warmth, but really, a lesson showing the dangers of exposure, and the use of
the light clothing, What to do ? that was the poser, seeing him come out of the passage like
that convinced me I wouldn' like to try it without wetsuit so the only solution was for him to
get out with my jacket on, give it to Mick, and try to force him up the hole with it, while Ben
shot to the surface to get his wetsuit. On this we agreed so off he went, while I was lef
behind to keep warm.

‘About things that appear impossible, when there is desire to do it, most impossible becomes
possible, and what was impossible for Mick to achieve at start became his achievement once
Ben told his story and had given back my jacket

Mick was back with me in double quick time, much faster than I'd thought could be achieved
and after putting my wetsuit back on and the blood become liquid again I thought he deserved
a kiss but shook his hand instead

After showing Mick the finds of which the junction I'd called "Crewe Junction” and we'd
‘mutually agreed to call the passage "Hypothermia Craw!" we retreated.

Ben was awaiting our exit and after a ciggy we motored back to the surface by this time Ben
was really excited, apparently he'd been digging around for ten years professionally (he was
on the dole) and was reckoning this find was the best of Derbyshire's last ten year’s finds.
After settling him on the names "Crewe Junction” and "Hypothermia Crawl" we gave him
permission to invite Paul Deakin, the photographer from Eldon, to photograph "Crewe
Junction"

At the present time of writing we have no idea if the find has been entered again for
photographs or anything else, because shortly after this trip the draught suddenly ended very
dramatically, and as the passage "Hypothermia Crawi" is a water course, and a tight one at
that, we assumed, although this is not known fact, that it may take a larger volume of water,
and if this is the case, two inches more water down that place would make it impassable and
also a pretty dangerous place to be as the water would tend to back up against your large
obstruction Now it is needed to know, does the volume of water increase? and where does
that aven go? also is the boulder choke
passable?

Any member of the club weighing 20
more than 160Ibs wet through is more
than welcome to extend our knowledge,
in the mean time I await a favourable
time that I can go in again myself

(Party; Mick Stratford, "Digger" Ben
[Keith Bentham -Ed.], Myself)

AS.Kowalik, April 1975 i

Oxlow (Comments sent to DCA

Dear Jenny.

‘As Ralph has said, Lionel (Parkinson) & I had a look at the unstable slope between
the Ist & (old!) 2nd pitch in Oxlow yesterday. As I'm sure we all know the whole area
is a mess! I suspect the whole area is a back filled stope all the way from the base of
the entrance shaft to the base of the ginging of the 2nd pitch, a vertical distance of
some 130fthrough tailings, to clay Just for good measure there's water running
through the lot, not a nice combination, It represents an old decaying industrial
problem which to make good properly would require industrial sized resources
Therefore anything we could do within financial & logistical constraints is likely to be
a stop-gap at best. The top of the slope is overhung by several large boulders which
seem stable enough but their presence would probably prevent any blasting to
stabilise the slope, for fear of sealing the place for ever. Looking down the slope (all
refs. to right/left will be from this direction) the stope hades at 10-1Sdeg from R to L
the LH side therefore being the hanging wall.

1OfK(ish) from the shaft base is the large slump repaired by Crewe some 10 or more yrs. ago.
This repair consists of heavy galv. 4in angle across the top & a Sin rsj 5ft below bolted
between the stope walls. Heavy timber packing is between these but this is now rotten & the
packing by the LH wall has gone completely..this is directly under the P bolts at the (new)
pitch head & just where you stand to get on/off the rope! Below the rsj the collapse has gone a
further Sft vertically, the (unsupported) lower bit is big boulders in a wet clay wall. A 10%
high wet clay & boulder wall is not going to stand for ever & may well collapse when
someone gets on or off the pitch.

About 15-20 lower dawn the slope is a timber jammed across the stope, it is undermined by
water washing material from beneath it & could do with replacement, More seriously, a large
piece of the hanging (LH) wall is starting to come away at this point. This is moving now!
Part of the crack is covered with wet sloppy clay & the crack is clearly defined in the over
lying clay. I suggest advising people to avoid this area for the time being (just keep to the
opposite wall). It may be possible to wall bolt this bit or just blast the dodgy bit off.

Back to the 10% drop. Half way between the current bottom & the rsj, the walls are in good
nick & even have shallow holes (pre back-filling?) in appropriate places, so another rs} could
be fitted here (measurements taken), The bottom itself is a different matter. The hanging wall
is under-cut & obscured by back-fill, so a better option may be to dig out the back fill drill
both walls, ss bolt them & cast a reinforced concrete lintel across ( approx.0.6 cu M) in one
operation. The drop could then be built up with blocks & heavy steel mesh to allow the water
out, Quite a big job. Altematively go with Ralph, bolt a traverse down the RH wall & let

gravity take its course!
Cheers, Nigel

NB: We have also suggested a bolt to replace the VERY old rawibolt set into the
conerete surrounding the lid, —Ralph

‘Thanks Aga

I have received a further letter from DCA thanking all those involved in removing the
decaying animal remains from Eldon Hole.

®
Well, may be one day!!

Having discovered that in nearly 10 years of caving Gareth had never been down PS we
decided to remedy this, In an effort to resurrect our Wednesday evenings out Mark, Gareth
and I sent off having arranged to meet on of the new members Colin at the lay-by.

Following a prompt start from Macclesfield we headed for Perryfoot full of enthusiasm
despite the torrential rain that had fallen all day. We arrived at the lay-by to find Colin
surrounded by two other parties, one a bunch of beginners, some 10 to 15 people m total.

Mark tried to suggest that taking a lot of novices down P8 in those conditions was not
a very good idea but this was greeted with the response that one party was led by
someone from DCRO. This turned out to be Howard Taylor, an old pal of mine from
way back. We saw chaos ahead; so on with plan B. Gautries, poor Gareth would just
have to wait for another day to do PS

‘An easy trip in to the first chamber was in surprisingly low water for the amount of rain that
had fallen over the last two days. The low crawl to Angle chamber was also quite dry but the
puddles were still mightily cold on the tackle (bags that is). A quick pull on the hand line put
us in the passage to the duck. Much to our amazement it was dry with only a few mm of water
in the bottom so a full soaking was avoided,

‘A ladder was rigged to make the climb back from the main chamber and soon we were all by
the Dam at the terminal sump. The tube at the side is usually sumped after 3 or + metres but
could see way beyond this and I was soon engaged in a wallow in mud. About 8 metres of
passage followed to a muddy blockage with an opening to the right, which even Matt could
not fit, through but from which the sound of running water could be heard. This is definitely
worth another look at.

In the meantime Colin was attacking the main sump, which was completely dry. After a few
minutes work shovelling sand he was able to wiggle through feet first to find that there was a
low passage beyond, As now of us brave soles fancied the prospect of going after him ifhe
got stuck we suggested he left this for another day when we can bring some gear with. As the
uide says this sump is blind this may be worth getting the club involved. The generally low
level of water in the cave was very surprising give the fact that it had rained heavily for 2/3
days prior to our visit and we wondered if the storms of the winter had cleared a blockage
lower down the system.

‘On the way out a look down the passage beyond angle chamber showed that the sump was
some 1$ metres lower than normal. A climb down a pitch I have never seen before led to a
small continuation before the sump was seen. Yet another change. !!

Back though the puddles Colin and Gareth had a play down the first section of the cave where
the pipes are still sluicing and then of to the Pub to listen to the Folk singing and to drink the
‘odd beer or two, or three or four in Mark case. Maybe not P8, but we had a very interesting

night out.
John Martin

®
Forthcoming Meets

Sunday 10" September  Ogof Hesp Alyn (North Wales)
Saturday 23° September Lost Johns (Leck Fell)
Sunday I* October Pos trip J H (Bradwell)
Sunday 8° October Bagshaw Cavern (Bradwell)
Saturday 21" October Parys Mountain (Anglesey)
Saturday 28" October ‘Out Sleets Beck (Penyghent Fell)
Saturday 11" November Stump Cross Caverns (Patley Bridge)
Saturday 25" November _Hillocks/Knotlow/exchange  (Monyash)
Sunday 3" December —_Lathkill head (Monyash)

Check also the current DCRO newsletter for training and social events. Nigel Atkins is
organising an SRT training event at Pindale "sometime before Christmas", and there are of
course weekly digging and general last minute ‘rips going on, if you're not sure what's
happening, ring around.

In view of the trip which Nigel is organising and following a recent trip to Anglesey, I
thought you might be interested in seeing the following text which forms part of a
publicity leaflet available.

John

PARYS MOUNTAIN COPPER MINES
AMLWCH, ANGLESEY

A BRIEF HISTORY OF THE MINES.

It was not until the mid-eighteenth
century that the first major ore deposit
of the modern industrial era (the
“Golden Venture Lede") was discovered
by Jonathan Roose. His tombstone and
eulogy may be seen todey in Amlwch
churchyard. At this time the mountain
was divided between two owners leading
to the development of adjoining mines,
the Mona Mine to the East (owned by on
ancestor of the present Marquess of
Anglesey) ond Parys Mine to the West.

The copper from these two mines
dominated the world's markets in the
1780's. It was used to sheath the
admiralty's ships of war, in order to
prevent the growth of seaweed and
barnacles ond to prevent bering by
worms. This increased their
manoeuvrability and made possible
Nelson's victories. The post-war slump
and diminishing accessible or reserves,
together with competition from cheaper

ores abread, led to the decline of the
mines and to the end of deep mining in
the 1880's,

The ore was initially worked on the
surface from shallow shafts and then by
open-pit mining (Opencasts) and later
underground from adits and from shafts
up to 300m deep. The ore was broken
into small lumps by hand, the best ore
being transported by ship fram Amiwch
Port to Lancashire or South Wales for
smelting. Copper was concentrated and
extracted from the remainder using
kilns and furnaces on site and at Amiwch
Port itself. It was also discovered that
purer metal could be obtained
efficiently, although in small amounts,
by its precipitation from drainage water
with scrap iron in purpose-built ponds.
Associated with the mines, other
important chemical industries were
established on the mountain based on
by-products, such as ochre pigments,
sulphur, vitriol and alum
The 18” Century miners recognised that
they were following in the steps of much
earlier workers, an observation that was
linked to the discovery locally of copper
ingots bearing Roman inscriptions.
Recently, excavations have enabled
surface debris to be dated to nearly
four thousand years ago, (the early
Bronze Age), and access has also been
regained to the sealed underground
workings of Parys mine revealing
evidence for this ancient mining. Parys
‘Mountain is thus an addition to the very
few sites in Britain, such as the Great
Orme, where there is evidence for the
prehistoric beginnings of our British
metal mining industry. It is therefore
internationally important both as a
historic mine and as an archaeological
site.

GEOLOGY and BIOLOGY OF PARYS
MOUNTAIN

The rocks of Parys Mountain originated
as muds in the margins of a sea basin
around 440 million years ogo, At that
time submarine voleances were erupting
lavas and ashes, and the fumes they
exhaled produced rich deposits of
metals on the sea floor, These metals
occur os the sulphide minerals
chacopyrite (copper and iron), golene
(lead), sphalerite (zinc), with abundant
pyrite (iran), and they form on ore
deposit (*Kuroko type") which is unique

in Britain. During later distortion of the
earth's crust (the “Caledonian Orogeny”
circa 400 million years ago) the ore
deposit was deformed by being titled
steeply down to the north, folded
(synclinal structure) and fractured
(Faulting), although this interpretation
is currently under revision. During
these phases of deformation some of
the metals were remabilised, giving rise
to. complex are body.

The weathering of this deposit has
produced very acidic conditions (pH s 2).
The abundant iran has been redeposited
in different forms to give the striking
red and brown colours of the mountain;
there is little surface sign of copper
today, but lead wes redeposited as its
sulphate (‘anglesite") for which Parys
Mountain is the type locality.

This extreme, harsh, acidic setting has
resulted in a unique environment
supporting unusual forms of | life.
Special bacteria derive their energy
from the oxidation of sulphides, and a
rich flora of special lichens can be
found coating rock surfaces, whilst
heather survives over most of the
mountain. Bats, including the rore
lesser horse-shoe bat, have colonised
the mine workings, and amongst the
birds to be seen soaring with the
yackdaws over the opencasts are the
red-leqged/tilled choughs
Not again.

Yes, for those of you who haven't heard, a year after our extended trip down JH, it was felt that Rob (Farmer)
and 1 hadn't been caving with DCRO in a while and so we surfaced from an evening trip down Nettle just in
time for a major callout to be avoided. Worse still was that the task of making the callout fell to Steve (Evans)
and Paul (Nixon) again. Basically we'd gone underground a lot later than we'd been planning to earlier in the
week (it was a hot day...) and conversations then about what time we were going underground led to a callout
when neither of us could be raised on the ‘phone that evening - despite the fact we'd only just set off. By pure
‘chance we cut short our trip by a couple of hours and averted a full scale rescue. Moral of the story, even if you
think you're not expected out until late, make sure someone obvious has a definite call-out time - even when it
‘means ringing someone at 2am just to say you're OK! (steady relationships do have a role to play in caving after
all.) Rob and [ haven‘ been outrighfdyanned from caving in Derbyshire yet, although the fact that we've been
‘asked to leave a date as our call-out time in future and that we've only been caving as a pair in Yorkshire since
then does have an element of truth ! Incidentally, Crumble and Beza pot make for a classic Yorkshire trip in
Derbyshire and come highly recommended, even if The Shakes are reminiscent of an unstable, s**t filled
Derbyshire again when you reach the bottom.

Matt

www. cepeorg.uk
With apologies for those people with no access to the Internet...

The long needed big update to the website is about to happen, it will
again be at least vaguely up-to-date again (too much caving...) We're
now on commission for another couple of websites although nothing
that's going to make the club rich overnight. All of the schemes work
by paying us for links people make to their sites from ours, so if you're
visiting any of the sites below, please remember to go via the club SS
homepage. Why not make www.cepc.org.uk YOUR homepage ?

amazoncouk 2 an on-line bookstore and will pay us 5-15% commission on all goods bought.

I've made a page listing all the caving books they sell (www.cepe.org.uk/books),
so if anyone has read any of them and fancies writing a line or two about them then feel free. With a
bit of work we can be selling books to cavers throughout the world and making a reasonable sum of
money out of it. Amazon is an established online retailer and by far the biggest online bookstore in the
UK and worldwide. They sell lots more besides books, including CDs, videos and software, all at a
discount prices. Be aware that you will have to pay for delivery though. They offer unrivalled
‘customer service and I wouldn’t hesitate to recommend them to anyone.

Gougle ® intelligent web search engine and will pay us a whole American cent for each
: search conducted from our website. If you've ever tried and failed to find something on
the Internet then give Google a try - it returns much more useful results than other search engines.

is the service Ralph and | use to get the weather forecast delivered free
keepAhead.com every moming by e-mail, The forecast is regional and fairly

comprehensive, plus seemingly no less accurate than anything else, The company offers literally
hundreds of such services if you think you'd like more mail

®@
LED lighting - An Electric Carbide

John Martin has been investigating these new LED bulbs which take a lot of the hassle out of constructing a
very alternative light source. He received the following e-mail from John Biffin who is manufacturing them for

cavers in the UK,

[Sorry for delayed reply, I have just a:
UK. Dragon and Inglesport are both se
| bulbs, or I can sell them direct. The cell packs and
| chargers are currently available from me. The LED
bulbs are avaiable in a number of formats, and the
| popuiar variants ace shown below with retail pr

Tf gon wave an; questions, feel ince be telephone te
p= <<):
GE (mobile)

|
| seaeeee
Soha BEEri¢
|
| LED pilot bulb (1 led), mes, 4 volt nomt:
| LED pilot bulb (1 led), mes, € volt nominal
| tep bulb (7 led), mes, 4 volt nominal
| uep (3 led), mes, 4 volt nominal
| uep (3 led), pf, 4 volt nominal.
| uep (3 led), pf, 6 volt nominal.
|

WiMh cell packs, 4.2 volt approx,

Pictures of the above are available at http://ledtechno homepage.conv/index. html

There has also been considerable recent discussion (31% August 2000) of these bulbs, and of LED lighting in
general, in the uk rec.caving intemet newsgroup. Archives can be viewed at
http://www deja.com/group/uk rec.caving

Inglesport appear to be hiring out LED equipped headsets now, so this is something you may like to try before
‘commiting to buying such a device.