If you need assistance, please send an email to forum at 4hv dot org. To ensure your email is not marked as spam, please include the phrase "4hv help" in the subject line. You can also find assistance via IRC, at irc.shadowworld.net, room #hvcomm.
Support 4hv.org!
Donate:
4hv.org is hosted on a dedicated server. Unfortunately, this server costs and we rely on the help of site members to keep 4hv.org running. Please consider donating. We will place your name on the thanks list and you'll be helping to keep 4hv.org alive and free for everyone. Members whose names appear in red bold have donated recently. Green bold denotes those who have recently donated to keep the server carbon neutral.
Special Thanks To:
Aaron Holmes
Aaron Wheeler
Adam Horden
Alan Scrimgeour
Andre
Andrew Haynes
Anonymous000
asabase
Austin Weil
barney
Barry
Bert Hickman
Bill Kukowski
Blitzorn
Brandon Paradelas
Bruce Bowling
BubeeMike
Byong Park
Cesiumsponge
Chris F.
Chris Hooper
Corey Worthington
Derek Woodroffe
Dalus
Dan Strother
Daniel Davis
Daniel Uhrenholt
datasheetarchive
Dave Billington
Dave Marshall
David F.
Dennis Rogers
drelectrix
Dr. John Gudenas
Dr. Spark
E.TexasTesla
eastvoltresearch
Eirik Taylor
Erik Dyakov
Erlend^SE
Finn Hammer
Firebug24k
GalliumMan
Gary Peterson
George Slade
GhostNull
Gordon Mcknight
Graham Armitage
Grant
GreySoul
Henry H
IamSmooth
In memory of Leo Powning
Jacob Cash
James Howells
James Pawson
Jeff Greenfield
Jeff Thomas
Jesse Frost
Jim Mitchell
jlr134
Joe Mastroianni
John Forcina
John Oberg
John Willcutt
Jon Newcomb
klugesmith
Leslie Wright
Lutz Hoffman
Mads Barnkob
Martin King
Mats Karlsson
Matt Gibson
Matthew Guidry
mbd
Michael D'Angelo
Mikkel
mileswaldron
mister_rf
Neil Foster
Nick de Smith
Nick Soroka
nicklenorp
Nik
Norman Stanley
Patrick Coleman
Paul Brodie
Paul Jordan
Paul Montgomery
Ped
Peter Krogen
Peter Terren
PhilGood
Richard Feldman
Robert Bush
Royce Bailey
Scott Fusare
Scott Newman
smiffy
Stella
Steven Busic
Steve Conner
Steve Jones
Steve Ward
Sulaiman
Thomas Coyle
Thomas A. Wallace
Thomas W
Timo
Torch
Ulf Jonsson
vasil
Vaxian
vladi mazzilli
wastehl
Weston
William Kim
William N.
William Stehl
Wesley Venis
The aforementioned have contributed financially to the continuing triumph of 4hv.org. They are deserving of my most heartfelt thanks.
Registered Member #10
Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424
Correct (5mw). This pic makes it clear. Even with moonlight, there is something not right about long night exposures. Maybe its the moon rocks spectral absorption..... You can see the star streaks on the bigger photo which I have cropped to exclude on the smaller one. I used my laser scanner to do that and left it on for about 2 of the 6 minutes of exposure. The other clue was the shadow of the tripod from the kitchen window light seen near the base of the tree.
Next photo was taken by my camera phone on night mode taken when cycling home from from a fortnightly clinic in a nearby (45km) town. It would have been more dramatic with my good camera and a decent lens. What is going on?
Registered Member #10
Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424
It is indeed a burning tree. Burning branches and leaves were falling off with big showers of sparks. Why is it burning? Electrical service along the road is visible in the photo but no branches to the tree (pun intended).
Registered Member #10
Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424
Electroholic wrote ...
Huge A55ed CO2 tube?
When I first read that I thought "I haven't heard of an A55 tube"
The picture is simply a burning tree. Some one was burning off and the flames lit the tree but the original fire died down quickly. Was quite stiking at night. Full pic shows the context.
Next is a piece of equipment. I didn't know what it was until I read the manual. One component has been removed.
So is it: 1 A Dalek 2 Recently declassified beam weapon 3 Other and if so, what.
Registered Member #10
Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424
I was told it was an "ultraviolet coagulator" retired from a local hospital in the ? 80's before being sent to the Physics Dept to see if they could use it. It lay there gathering dust for years before a recent clean out and it passed to me.
It is actually a short arc Xenon source for eye lesion coagulation. A precursor to my YAG ophthalmic laser as it were. Unfortunately, the Xenon lamp was removed. It is interesting because the output (the black tube) is on a finely balanced gimbal and can be moved 6 inches in all directions to allow it to be brought up to the eye. The whole xenon assembly moves as well. 3 phase power is required. The power meters give an idea of the power draw. Optics are by Carl Zeiss and lots of interesting stuff in there.
Next Mystery photo No 38 is one of those "wow" demos that you call the family out to see.
This site is powered by e107, which is released under the GNU GPL License. All work on this site, except where otherwise noted, is licensed under a Creative Commons Attribution-ShareAlike 2.5 License. By submitting any information to this site, you agree that anything submitted will be so licensed. Please read our Disclaimer and Policies page for information on your rights and responsibilities regarding this site.
Mystery Photos from TDU
