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 #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
Yeah, somebody should start acrylic Q&A thread but won't bother cristopher neither!
When I tried to bend it it looked like hell, nowhere to get that pretty dichloromethane solvent, and I didn't even know there are such things in existence as acrylic tubes! :p
Registered Member #71
Joined: Thu Feb 09 2006, 08:23AM
Location:
Posts: 63
Green laser light being diffracted through something weird... Can't make out what that "hook" on the left is. Maybe a long exposure of drifting fringes from a interferometer?
Registered Member #116
Joined: Fri Feb 10 2006, 03:19AM
Location: Erie Pa, USA
Posts: 29
This was not too cool when it happened, but in 1985 I was on an Iberia airlines flight from Frankfort to Madrid and it taxied into a fuel truck after landing. It felt like someone chucked a log under the left main wheel. The stewardesses weren't too happy with me snapping shots of the fiasco. Most of the other passengers were Germans and at that time I spoke enough German to be amused at their sarcastic remarks. We had to de-plane out the rear airstair. (It was a Boeing 727 btw)
Registered Member #8
Joined: Thu Feb 02 2006, 04:34AM
Location: Harlowton, MT, United States
Posts: 214
Kind of old, but these are some nice close up shots of my xenon short arc lamps. It would be interesting to get a shot of one running like through a darkened filter of some kind, but I'm not sure just how to go about it.
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Jeez, those look like they mean business! Did you ever get one to light? I remember trying to get a smaller mercury short arc lamp to light, it was a total pain since it took something like 2kV to strike and then 12V @ 10A to run. That was before I knew about Tesla coils, though, it would be easier now When I finally did get it to strike, I was shocked by how bright it was (and probably dangerously UV-rich too...)
PS: Do you know what the cooling requirements are? Those lamps look like the kind of things that would explode violently if they didn't get enough airflow.
To get a picture of the arc, I'd use a pinhole camera to project it onto a piece of white paper and photograph that. The arc in mine looked like a tiny sphere about half the size of a rice grain.
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.