User talk:DonPMitchell

From Wikipedia, the free encyclopedia
Jump to: navigation, search

Changes about the landing sphere[edit]

Hi! Is it for sure Venera 1 not having a landing sphere? Can you give some sources? I would then also correct it on the german Venera article --Bricktop 10:26, 14 Apr 2005 (UTC)



Hello DonPMitchell, and welcome to Wikipedia! Thank you for your contributions. I hope you like the place and decide to stay. Here are a few good links for newcomers:

I hope you enjoy editing here and being a Wikipedian! Please sign your name on talk pages using four tildes (~~~~); this will automatically produce your name and the date. If you have any questions, check out Wikipedia:Where to ask a question or ask me on my talk page. Again, welcome!  Titoxd(?!?) 06:16, 6 October 2005 (UTC)

You seem to know what you're talking about. Do you mind taking a look at the Exploration of Venus article? It's in bad shape, and it is directly related to the material you're adding. Titoxd(?!?) 06:19, 6 October 2005 (UTC)

Hi Don, thanks for your improvements to Geology of Venus! Are you the Don P. Mitchell referenced in Don P. Mitchell? Keithlard 13:35, 6 October 2005 (UTC)

Hi, yes this is Don P Mitchell. Not sure if this is where I reply to your question, I just sort of grok how to edit Wikipedia pages. I'm writing a book now on the Soviet Exploration of Venus.
Thanks Don. Great to have you here! I've added you to Category:Notable Wikipedians as you'll see from Talk:Don P. Mitchell. I hope if you have time you'll be able to expand the biographical details at Don P. Mitchell slightly - if you like you can put any information that occurs to you on the Talk page, and have someone else write it up for the main page. Keithlard 10:07, 7 October 2005 (UTC)

Remastered surface images of Venus[edit]

Hi there. I noticed that someone recently has uploaded your remastered Venera images at Image:Venera13Surface.jpg and Image:Venera14Surface.jpg. He has credited you, but are you okay about this? (You can reply either here or on my talk page). Regards, --BillC 11:53, 23 September 2006 (UTC)

Thanks for replying on my talk page. BlueMars has replied to you below and I hope that you can come to some agreement over licensing. As with all copyright issues, I would advise for prompt action here to prevent the images 'escaping'. Thanks also for your insight into NASA copyright issues. Copyright in general in Wikipedia can be discussed at Wikipedia talk:Copyrights, and specific concerns at Wikipedia talk:Copyright problems. Incidently, let me congratulate you on the Venera images, which are remarkable. Regards, --BillC 20:51, 26 September 2006 (UTC)

(Moved from user page to talk page by BillC):
Hello, First of all, I want to apologize for not asking you for your permission regarding the usage of you images on Wikipedia. I wasn't aware that you are owner of their copyrights. In addition to that, I misread the copyright date of the Soviet Union-tag (1983 instead of 1973; it was 0:22am :-P). As a conclusion I want you to formally ask for your permission to use your images on Wikipedia for non-commercial usage, so we can clean the image-pages up an add a "permission by author given"-tag. Thanks and sorry for the inconvenience. --BlueMars 14:42, 26 September 2006 (UTC)

Yes, you have permission to use my Venera-13 and Venera-14 images on Wikipedia, for non-commerical use.

Hello again,

I've looked through the copyright guidelines of Wikipedia, where it is clearly stated, that images released by their author for non-commercial Wikipedia-only use cannot be permitted. The only valid copyright tag available would be this one:

However, I'm afraid this would not be in your interest, so I am afraid we will eventually have to delete the images, which I really regret. Your remastering has really helped not only to bring new live to the Venera missions, but also to make Venus more like a "place where one could be one day", as Carl Sagan remarked about Mars after he has seen the first images from the Viking 1 lander.

Feel free to check the copyright standards of Wikipedia youself. To be honest, I find it a bit strange that it is not possible to release a picture in Wikipedia for non-commercial use only... Regards --BlueMars 15:01, 30 September 2006 (UTC)

Unfortunately, but I am not willing to declare the images "public domain". Not because I plan to profit, but because I am philosophically opposed to wikipedia demanding that. Particularly since I am not sure what wiki's long term plans are about profiting from books or other commercial ventures. I suggest we remove the image and retain a link to my catalog page, so people can see the Venus images in their original form as well as the perspective projection. DonPMitchell 15:05, 30 September 2006 (UTC)

I just discovered what might be a possibility to use your images and keep their copyright under Fair use. I've added the respective tags to the image pages. Review my changes. If you do not agree, I will delete them. --BlueMars 15:28, 30 September 2006 (UTC)
Cool, that's fine with me. Thank-you for taking the time to resolve this. DonPMitchell 17:12, 2 October 2006 (UTC)
No problem. --BlueMars 20:39, 2 October 2006 (UTC)
I wanted to nominate your Venera picture for Featured Picture, is that okay or not, TPTB seem to say its not under the current licensing but maybe if you gave your permission and left it on the image page or something they would allow. I really like the picture, I always wondered what Venus looked like at the correct angle. A mcmurray 02:24, 4 November 2006 (UTC)

Don P. Mitchell[edit]

Hello! Don P. Mitchell is not the appropriate spot to post information about yourself, because that's the encyclopedic part of the Wikipedia website. User:DonPMitchell, however, is available for personal information about yourself. Please see Wikipedia:Introduction and Wikipedia:User page for more information. --Slowking Man 12:37, 4 November 2006 (UTC)

I did not create the DonPMitchell page. Evidently a living scientist cannot have an entry about themselves? I don't know. Delete it if you like Mr. Slowking. DonPMitchell 20:34, 4 November 2006 (UTC)

I didn't think you did. I tried to convince Slowking that it wasn't a vanity page but that user wouldn't listen, so whatever I guess. A mcmurray 10:29, 9 November 2006 (UTC)
Also if you want, you can post some biographical info here or on my talk page and I will bring the article back with that as a reference, because, yes, living scientists should have wikipedia entries, or just point me in the direction of any relevant biographical material, either way I am more than happy to write it up. A mcmurray 10:32, 9 November 2006 (UTC)


Greetings! I'd like to send you an e-mail, but you don't have an address enabled here and I'm not certain if the addresses I found on a web search would still reach you. You can reach me at or on my talk page. Cheers, Kat Walsh (spill your mind?) 02:42, 19 July 2007 (UTC)

Don posted to his blog on Tuesday, July 17, 2007, so I think it is safe to assume that's a live contact. --KSmrqT 05:11, 19 July 2007 (UTC)

On image copyrights[edit]

I recently came across this, and thought I should say something, though I'm not quite sure what. For what it's worth, there is a list of licenses besides the public domain one, most of which could be used instead. Though, they all roughly translate into allowing any use, as long as reuse is permitted.

Wikipedia's policies are far too complicated for anyone's good, and are in definite need of simplification and clarification. Thanks for contributing. -- kenb215 talk 13:40, 3 August 2007 (UTC)

Thanks Kenb215. I've looked at GFDL, and it appears to be a complete abrogation of my rights. It's inappropriate for wikipedia to ask people to give up their rights beyond the scope of wikipedia. I'm willing to license my work for free to them. If that's not good enough, then they may not use my images. DonPMitchell 00:00, 4 August 2007 (UTC)
Is there some original PD material that others can use to clean up for free use? Bcsr4ever 14:14, 11 September 2007 (UTC)

I've thought about this and have decided on a compromise. I am willing to license a somewhat smaller version of the Venera image under some suitable license for wikipedia. I'm not quite sure how one goes about "attaching" a license to an image in this case, but this is the picture I will be licensing: Venus Surface.

The actual original version of this image is much bigger than anything ever posted on the web (1600 pixels high). That will be available for free to authors, but only for publication in print form. DonPMitchell 15:04, 14 September 2007 (UTC)

Wikipedians' views of policy[edit]

Hi Don! As you may have noticed, some wikipedians are a bit policy-bound, to say the least. (My personal tendancy is to mock them mercilessly for it, but in truth that isn't particularly constructive. ;-) Even with that said, it might make sense for you to get a bit more background on some of those policies they defend so doggedly. In particular, reading WP:OR would probably make a lot of sense in your case. For readers unfamiliar with the policy, even just reading the "in a nutshell" box at the top of the page provides a decent introduction. My personal summary would be, "Be really careful using your own work as a reference." In point of fact, my bet is that in most cases it isn't worth the hassle: it would likely be easier to find someone else's work to cite than it would be to fight the battle required to cite oneself. Linking to personal websites probably falls under this category. If the link is really worthwhile though, mention it on the talk page for an article, and get someone else to make the edit to the article. I know this sounds like bureaucratic hassle, but sometimes it's easier to "work with the drugs", as they say. Anyway, happy editing! (sdsds - talk) 17:08, 4 October 2007 (UTC)

Is this in reference to a particular problem? DonPMitchell 17:32, 5 October 2007 (UTC)
Superficially at least, this edit might be (mis)taken for self-promotion. (sdsds - talk) 23:31, 5 October 2007 (UTC)
Sidiqqi, Zak and I happen to be experts on soviet space history. But you are free to delete the links, and I will make no attempt to replace them. DonPMitchell 16:12, 6 October 2007 (UTC)

Electrical Experimenter[edit]

Hi, the Academic Journals wikiproject is collaborating on Electrical Experimenter this week, and it would be great if you could help us. If you have physical copies of this magazine that are in the public domain (i.e. pre-1923), it would be great if you could scan a few pages, upload them to Commons, and note the availability on our "Transcription" page. Cheers, John Vandenberg (talk) 09:37, 17 February 2008 (UTC)

Hi, I got a note a few months about about collecting Electrical Experimenters. Sounds exciting. Are they in the public domain now? I don't have any issues, but I have Xerox copies of the Nikola Tesla articles and a few others. DonPMitchell (talk) 17:06, 23 June 2008 (UTC)
The pre-1923 editions of Electrical Experimenter are all PD, and later editions probably were not renewed, making them PD as well.
I have done a quick check on Tesla, and it looks like all of his works are in the PD. There are very few Tesla works on, so we would love to hear about which works of his you could provide; let us know over on s:Author:Nikola Tesla. The more obscure the better! :-) Do you have access to a scanner? If so, we have notes at s:Help:Djvu on how the images can be packaged into a djvu file, but even if you can only do the scanning, someone at Wikisource will be only too happy to figure out a way to obtain the pagescans from you and put them online. i.e. I can give you ftp access to my server where you could deposit them.
See s:Index:The Solar System - Six Lectures - Lowell.djvu for an example of what we do with the pagescans, and s:Index:H.R. Rep. No. 94-1476 for an almost complete project. John Vandenberg (chat) 17:04, 24 June 2008 (UTC)


Hi, I just came across your article on Langemak. How nice to see such a nicely written article. I'm a soviet-space-history guy. DonPMitchell (talk) 23:16, 6 July 2008 (UTC)

Thank you. You may find this an interesting list: Talk:List_of_craters_on_the_Moon#Mystery_eponyms. For me it proved quite futile trying to find more than cursory details on the listed individuals.—RJH (talk) 14:56, 7 July 2008 (UTC)

HEAO 3[edit]

Yes, I was at JPL with Bud Jacobson's group on the Ge spectrometer, C-1 starting in 1979. I'd love it if you could beef up the discussion of the C-3 experiment (or point me to some easily accessible references I could read and comprehend myself in a short time). I'm working now on the Spitzer Space Telescope at Caltech. Were you a student or postdoc there? What are you doing now? Cheers, Bill Wwheaton (talk) 08:09, 13 July 2008 (UTC)

I was a graduate student, working on the heavy nuclei detector. Got a job offer from Bell Labs and dropped out my third year. I'm retired now, working on a book about the Soviet space program. DonPMitchell (talk) 15:56, 13 July 2008 (UTC)


You've really should add at least some sources, not just hope someone will. You must have gotten your information from somewhere. DGG (talk) 21:28, 21 September 2008 (UTC)


(I'm moving this from my user page. Someone kind enough to answer a question I had...)

[edit] atomization It would be helpful if there was information about various types of atomization (e.g., pressure-swirl, etc). DonPMitchell (talk) 18:15, 18 October 2008 (UTC)

Check in gasoline engines: Ricardo head ,preheating air by exhaust,high pressure direct fule injection into cilinder. Check in diesel engines;Ricardo prechamber, Lanova airchambers, prechambers bare and scaled,directional air ports in two cycle to induce rotation, one sided screens on inlet valves,sqeezing of air chanels, high pressure fuel injection ,blow in diesel with high pressure air into cilinder. Hot bulb engines the red hot metal surface will tend to evaporate the fuel.wdl24.146.23.84 (talk) 05:39, 19 October 2008 (UTC)

[edit] carburated gasoline distribution

Deuterium mass[edit]

You were quite correct that the article incorrectly gave the deuteron mass only. But adding the electron mass gave a number very close to the physics handbook answer. I put in the one with more significant figures, using CODATA figures for both. If you can find an error, please let me know. SBHarris 22:59, 25 May 2009 (UTC)

Later. In case you didn't see it, subtracting the binding energy for the electron gave exactly the physics handbook answer to its number of digits, so that's the figure we used. SBHarris 17:53, 4 June 2009 (UTC)[edit]

Are you aware that Google flags as a potentially dangerous site ("This site may harm your computer.")? (Google search) Google's diagnostic page gives the impression that the site has been hacked. See also the thread at Talk:Jaggies#Attack Site. --Zundark (talk) 12:01, 4 June 2009 (UTC)

Yes, my hosting service was attacked by Chinese hackers a few days ago, who inserted an Adobe Flash exploit into the pages. I'm working with to resolve this as quickly as possible. Currently, I am still locked out of the site, because the hackers changed the FTP password.  :-( DonPMitchell (talk) 17:51, 4 June 2009 (UTC)
Media3.Net suffered a server-wide attack, but they have resolved the issue. My site is back to normal, but it may take a few days before Google responds to the request to rescan my site and take it off their blacklist. DonPMitchell (talk) 02:09, 5 June 2009 (UTC)

My site is blacklisted again...again my hosting service ( has been compromised by hackers from various .cn sites. I will be changing hosting services, so my webpages might be down for a day or two. DonPMitchell (talk) 04:27, 14 June 2009 (UTC)

Problem fixed. My host service was compromised, not just my website. A security hole in Coldfusion, according to their tech guy. DonPMitchell (talk) 04:03, 15 June 2009 (UTC)

Coordinated Universal Time[edit]

Since you are knowledgable enough to make an intelligent edit to Coordinated Universal Time, perhaps you also know of a source to support the information? That passage has lacked support for quite some time. --Jc3s5h (talk) 15:42, 2 August 2009 (UTC)

I added a reference. Thanks. DonPMitchell (talk) 18:21, 2 August 2009 (UTC)
Thanks. I should have been more specific. I've never been able to find a reference for " It seems unlikely that a negative leap second will ever occur, but there is a small chance of one". --Jc3s5h (talk) 18:25, 2 August 2009 (UTC)
Ah. Yes, the moment of inertia of the Earth is shrinking a little faster than expected now. I've certainly read about the concern that they might have overshoot with the last leap second. I'll keep this in mind if I run across it again in a publication. DonPMitchell (talk) 19:02, 2 August 2009 (UTC)

Help needed over at Tsiolkovsky rocket equation.[edit]

Hi Don! I saw your name on the Tsiolkovsky rocket equation talk page and wanted to ask for your help with a dispute over recent edits there. Martijn Meijering (talk) 11:39, 14 August 2011 (UTC)

Please see…[edit]

this. I will be making changes shortly. Maury Markowitz (talk) 17:33, 29 November 2013 (UTC)

ArbCom elections are now open![edit]

You appear to be eligible to vote in the current Arbitration Committee election. The Arbitration Committee is the panel of editors responsible for conducting the Wikipedia arbitration process. It has the authority to enact binding solutions for disputes between editors, primarily related to serious behavioural issues that the community has been unable to resolve. This includes the ability to impose site bans, topic bans, editing restrictions, and other measures needed to maintain our editing environment. The arbitration policy describes the Committee's roles and responsibilities in greater detail. If you wish to participate, you are welcome to review the candidates' statements and submit your choices on the voting page. For the Election committee, MediaWiki message delivery (talk) 12:54, 23 November 2015 (UTC)

ArbCom Elections 2016: Voting now open![edit]

Scale of justice 2.svg Hello, DonPMitchell. Voting in the 2016 Arbitration Committee elections is open from Monday, 00:00, 21 November through Sunday, 23:59, 4 December to all unblocked users who have registered an account before Wednesday, 00:00, 28 October 2016 and have made at least 150 mainspace edits before Sunday, 00:00, 1 November 2016.

The Arbitration Committee is the panel of editors responsible for conducting the Wikipedia arbitration process. It has the authority to impose binding solutions to disputes between editors, primarily for serious conduct disputes the community has been unable to resolve. This includes the authority to impose site bans, topic bans, editing restrictions, and other measures needed to maintain our editing environment. The arbitration policy describes the Committee's roles and responsibilities in greater detail.

If you wish to participate in the 2016 election, please review the candidates' statements and submit your choices on the voting page. Mdann52 (talk) 22:08, 21 November 2016 (UTC)