User Talk: AJim

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Re: Faraday effect diagram, you're right about the direction of rotation (I checked in Hecht). I drew it that way because it was easier, not for any good reason. Actually I'm not too happy with how the diagram came out (I don't think it shows the rotation very well),so I'll try altering it and see how it looks. Oh, and welcome to Wikipedia! -- DrBob 18:59, 12 Mar 2004 (UTC)

Thanks, this is a lot of fun for me.
I like the look of the diagram, especially the color and shading.
I would have an easier time if it could show the direction of propagation.
For my money, showing the sense of the current flow, rather than the coil
itself, as Hecht does, would make it easier to apply the right hand rule to get the B field.
Am I right in thinking that the polarizers Hecht shows are essential to the isolator design?
That the 45 degree rotation (he implies) means that the reflected wave will be rotated 90 degrees and thus be blocked by the entrance polarizer?
The microwave isolator also includes an absorber for the relected wave. In the optical isolator is the dissipation achieved with a dichroic polarizer?
AJim 21:13, 12 Mar 2004 (UTC)

:I'll see what I can do with adding the propagation direction to the diagram - I might make it more like Hecht's diagram to make the polarization direction clearer. I think the coil would obscure things too much, though. Yes, polarizers are necessary for optical isolators, usually polarizing beam splitters on either end. They have adjustments to fiddle with the magnet spacing to get exactly 45° rotation at the wavelength you want. -- DrBob 17:56, 15 Mar 2004 (UTC)

It does not make so pretty a picture, but what I drew to check myself was an end-on view, looking into the source, no coil, just '''I''' circulating ccw. The right-hand rule then said that '''B''' was in the propagation direction. Then the rotation had to be ccw also from the definition. Perhaps the end-on picture might be a supplement? There is something mnemonic about the current and the rotation being in the same sense anyway. I found the coil distracting myself. I think there is a potential for confusion by introducing the coil helix sense.
The real fun, for me, is that I now understand Faraday isolators better. Thank you for that. AJim 22:57, 16 Mar 2004 (UTC)

Thanks for the compliment :) And you're right, that Sellmeier graph should be micrometres rather than nanometres along the x-axis. I've uploaded a corrected version. Thanks for spotting that. -- DrBob 16:15, 18 Mar 2004 (UTC)

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Tip (re Page Boy ↗ (which I've renamed to the apparently more standard '''Pageboy'''), you say:
:''The Page Boy is a hair style named after a drawing of a woman dressed as an English page boy.''
I'm wondering what your source for this is. Do you mean a particular drawing by a particular artist? Also, as far as I know, the style was actually popularized in the 1920s by the actress Louise Brooks ↗. I would expand the article a bit, but I'd like to drop the reference to the drawing unless there's a source. - dcljr 18:40, 23 Mar 2005 (UTC)

Cotton effect ↗

Hi there! You seem to be the guy to ask. Can you do anything with Cotton effect ↗ and with Optical rotatory dispersion ↗? I have just added them as stubs. Jeff Knaggs|Talk 11:08, 20 October 2005 (UTC)

Deuterium arc lamp update

Hello, I've justed started editing Wikipedia and I've started by expanding the stub on deuterium arc lighting. I've noticed that you have made some contributions to the Xenon arc lamp page and I was wondering if you might be able to give me some advice on things I could add, change, etc. Thanks!

eggles37 <small>—Preceding unsigned ↗ comment added by Eggles37 (talk • contribs ↗) 00:17, 8 October 2007 (UTC)</small>

Sheeran

I deleted the reference on the Sheeran ↗ page in response to a single purpose account ↗ linked to the book's publisher who was spamming links to a website promoting the book. If I remember correctly, the link is pretty promotional, but if you think it should be in, it's unlikely I'll visit the page or try to delete it again. --Steven J. Anderson (talk) 08:08, 24 December 2008 (UTC)

:Maybe I am confused. I think what was removed and put back was a simple citation of the book, not the link you mention. In fact, I think the link was, and still is, there. I agree the ''link'' is pretty promotional. I think the ''book'' ought to be cited as the source of the information about Sheeran. I do not think referencing the book gives undue weight. --AJim (talk) 08:26, 24 December 2008 (UTC)
::Without looking closely at what I did, I'll say you're probably right. I was kinda ticked at the SPA when I was reverting him and might have gotten a little over-exuberant. Apologies. --Steven J. Anderson (talk) 01:29, 25 December 2008 (UTC)

Re: question about "fix structure"

Oh my gosh, a user from 2004? I'm not worthy... :)

I've only seen section headings with 2d level, 3d level and so forth, not 1st level. I've read plenty of Wikipedia articles, and that's what I always see. When I saw your article, I said to myself "This doesn't look right" and I changed it. I did not intend to change anything substantive, only to reduce 1st-level headings to 2d-level, and 2d-level headings to 3d-level. I hope I did more good than harm. Crystal whacker (talk) 05:35, 2 January 2009 (UTC)

Lead poisoning

I replied at Wikipedia_talk:WikiProject_Medicine/Dermatology_task_force#Why_Lead_Poisoning.3F ↗. Thank you for your question. kilbad (talk) 02:33, 3 February 2009 (UTC)

Cary Instruments ↗

Hi. I saw your notes on Talk:Cary Instruments ↗. I started the article, and wrote from my experiences working in a lab that used a Cary-60 (we also had a Beckman Model-E, but that's another story). It sounds like you know more about these instruments than I do, and I encourage you to improve the article, especially if you can find reliable, citable references. -- RoySmith (talk) ↗ 20:42, 6 February 2009 (UTC)

{{ {{#ifeq:|{{void}}|void|Error:must be substituted}}|PRODWarning}}

Proposed deletion of Unittest

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Artificial altitude

Hi, AJim. I went to the pages you linked to at the See Also section of Altitude training ↗. None of the applications of those technologies involved people breathing the nitrogen-enriched air. They did not sound like appropriate links. Do you want to research people breathing their output? —hike395 (talk) 23:48, 16 June 2010 (UTC)

notes to myself

Combinatorial_number_system#Applications ↗, first step of Gosper's ↗ Hack is extract rightmost bit, 1972 HACKMEM 175 uses it. Therefore the rightmost bit trick is older than that. But I knew that, since Eric Jensen taught it to me around 1969. --AJim (talk) 22:13, 6 June 2011 (UTC)

having notes in an article as well as references:
<nowiki>e.g. place {{Ref|a|a}} in the text, then:
==Notes==
<div class="references-small">
{{note|a|a}} Some sources gives...
</div>
</nowiki>--AJim (talk) 03:11, 14 July 2011 (UTC)

Book references at Switching circuit theory ↗

Thanks! --Wtshymanski (talk) 18:17, 23 June 2011 (UTC)

Fessenden oscillator ↗

Hi there. Is there a chance your group can get a picture of the Fessenden hydrophone you are working on? One picture would be worth many words in the article. --Wtshymanski (talk) 17:59, 28 June 2011 (UTC)
:At the present time the supposed transducer is housed in a vertical cylinder installed near the midline on the inner hull in the forward magazines section of the ship. Access is difficult. The cylinder has a mechanism on top that appears to allow height adjustment of something inside. This cylinder has not been opened, to anyone's knowledge, in many years. It is not clear if the top of the cylinder is above the water line. We are very curious. We are proceeding cautiously. We have no current photo.

:In the meantime, there appears to be a historic photo available from the NOAA Photo Library ↗: ''Reginald Fessenden and his electric oscillator'' ↗. From the NOAA Library ''about'' page it appears that this photo is available for use. The photo shows an object of the approximate size and shape expected from the patent description and the article that this picture is used in ↗. My problem is that I do not have the time to read and try to cope with the current Wikipedia image upload rules. If you are familiar with the rules, and can navigate them(!), and think the image really is available, please go ahead and add it. The photo caption says the source is: "Submarine Signaling," Scientific American Supplement, No. 2071, pp. 168-170, Sept. 11, 1915.

:By the way, the NOAA article is an excellent source for other references. The article also includes, for instance, a transcript of the ''Report of Captain J.H. Quinan of the U.S.R.C Miami'' on the sea trials conducted on 27 April 1914, as reported in the Hydrographic Office Bulletin of May 13, 1914.

:The key patent, which describes the construction of the transducer, is {{US Patent|1167366}}, "Dynamo-Electric Machinery" – issued 4 January, 1916 (original application filed on 29 Jan 1913). It would also be useful to add Figure 1 from the patent to the article, or possibly a cleaned-up version. Again, I am not prepared to cope with this. However, the operation section of the current article has not yet captured some of the key design details, such as the opposed armature windings used to drive the copper tube in the opposite air gaps, and the claimed advantages of this design. It would be helpful to show the field orientations to help make it clear that the opposed windings ultimately produce forces that add. I can confirm that the net inductance of the two armature windings nearly cancels (< 1 mH, compared to 670 mH for the field winding, which is about the same resistance and apparent wire size).

--AJim (talk) 23:05, 28 June 2011 (UTC)

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Circular polarization

My understanding is that "mixed polarization" as described above is not allowed by the FCC -- only either Horizontal, Circular or Elliptical. Slant polarization, with H and V at different powers but in phase, is not allowed for FM or TV. See: CFR 47 § 73.316 ↗. I believe the entire paragraph should be removed.

-- algocu (talk) 19:01, 10 September 2012 (UTC)

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CD figure

Tables are boring. I put some colours ;) Check it out and tell me what do you think. Masur (talk) 08:08, 28 November 2014 (UTC)

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On the excellent advice about the prism monochromator

Thank for your advice,you help me to become a better wikipedian and let me know how to better deliver and distribute knowledge!I will add several lines on the photo you confuse about to show how light goes throw it.The change will happen about a week after,because presently I am not convenient for making change on wiki(I am in China,the tech equipments here are not properly set up).Thank you again! Warren Leywon (talk) 08:20, 27 March 2017 (UTC)

A barnstar for you!

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|style="vertical-align: middle; padding: 3px;" | Thank you for your advice!Now the photo has revised and you now can know how the light passes throw it. Warren Leywon (talk) 00:35, 2 April 2017 (UTC)
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Reminder to vote now to select members of the first U4C

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You are receiving this message because you previously participated in the UCoC process.

This is a reminder that the voting period for the Universal Code of Conduct Coordinating Committee (U4C) ends on May 9, 2024. Read the information on the voting page on Meta-wiki ↗ to learn more about voting and voter eligibility.

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More info on "Quartz Thermometer"

Hi, I am doing a research project on using crystal oscillators as temperature sensors. I saw that you helped write the article on the "Quartz Thermometer". The main thing I am looking for is a supplier of a temperature-sensitive crystal. I saw that you added the sentence: "Other manufacturers make nearly linear-in-temperature quartz crystals that may be used to construct thermometers of similar performance". Do you happen to have any other sources or know of any companies that supply such crystals?

Thanks for your help on Wikipedia! Arctic Chicken855 (talk) 16:12, 3 April 2025 (UTC)

Sorry, but I do not know a supplier. What I remember at the moment is that the trick was a particular crystal cut that resulted in an intrinsically linear temperature response, which is a great virtue, since there are so few calibration points. HP (the Agilent part) made the one I knew but I think they dropped the product. There must be a patent, it would have been by the 60's, and that should tell you the crystal orientation. Knowing what to ask for ought to help find a supplier. Sorry I can not be of more help. --AJim (talk) 06:46, 4 April 2025 (UTC)

Proposed deletion ↗ of John A. Spencer (inventor) ↗

left|link=|alt=Notice|48px| ↗

The article John A. Spencer (inventor) ↗ has been proposed for deletion ↗ because it appears to have no references. Under Wikipedia policy ↗, this '''biography of a living person ↗''' will be deleted after seven days unless it has at least one reference to a reliable source ↗ that directly supports material in the article.

If you created the article, please don't be offended. Instead, consider improving the article. For help on inserting references, see Referencing for beginners ↗, or ask at the help desk ↗. Once you have provided at least one reliable source ↗, you may remove the {{tl|prod blp/dated}} tag. '''Please do not remove the tag unless the article is sourced.''' If you cannot provide such a source within seven days, the article may be deleted, but you can {{#ifexist:John A. Spencer (inventor)|request that it be undeleted|request that it be undeleted ↗}} when you are ready to add one. Thilio<sup><span class="robot-signature"><span class="robot-text" style="color:green;">R O B O T</span></span><span class="robot-emoji">🤖</span> <span style="color:#00008B;">talk</span></sup> 01:14, 30 August 2025 (UTC)

John A. Spencer (inventor) ↗ moved to draftspace

Thanks for your contributions to John A. Spencer (inventor) ↗. Unfortunately, I do not think it is ready for publishing at this time because '''it has no sources'''.
I have converted your article to a draft which you can improve, undisturbed for a while.

Please see more information at Help:Unreviewed new page ↗.
When the article is ready for publication, please click on the "Submit the draft for review!" button at the top of the page OR move the page back. <span style="color:DarkGray">...</span> <span style="color:DarkOrange">'''disco'''</span><span style="color: #556B2F">'''''spinster'''''</span> <sub>'''<span style="color:DarkGray">talk</span>'''</sub> 01:43, 30 August 2025 (UTC)

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Concern regarding Draft:John A. Spencer (inventor) ↗

25px|alt=Information icon ↗ Hello, AJim. This is a bot-delivered message letting you know that Draft:John A. Spencer (inventor) ↗, a page you created, has not been edited in at least five months. Drafts that have not been edited for six months may be deleted ↗, so if you wish to retain the page, please edit it ↗ again or request ↗ that it be moved to your userspace.

If the page has already been deleted, you can request it be undeleted ↗ so you can continue working on it.

Thank you for your submission to Wikipedia. FireflyBot (talk) 20:08, 1 March 2026 (UTC)

You may be eligible to vote in the U4C election

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I am contacting you because you previously voted in elections related to the Universal Code of Conduct Coordinating Committee (U4C) ↗. You may be eligible to vote in the current U4C election, which is open now and closes on 2 June 2026. You can find out more about the candidates and the election on the election page on Meta ↗, and from there you can access the vote itself. Your participation in these elections is important to the governance of Wikimedia communities, and your time spent learning about the candidates and voting is appreciated.

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