Talk:Polarimeter

Latest comment: 6 years ago by InternetArchiveBot in topic External links modified (January 2018)

Untitled discussion 1

edit

Description of the operation of the instrument: I do not have a reference to hand. In my experience of using manual polarimeters, analyser and polarizer are crossed for maximum light extinction (minimum intensity) rather than parallel for maximum intensity. Whether by eye or instrument, the minimum intensity occurs at a much sharper angular resolution, and is much easier to find than a maximum on a rather broad plateau. It is also the case that in most of the optical instruments I have used a pair of Nicol prisms, misaligned by about 1°, has been used as the analyser, because it is much easier for a human viewer to colour match a pair of dark field images than to pinpoint the position of maximum darkness. Not sure whether or not that is also the case for instrumental detection of the light. Damocles2 (talk) 23:35, 21 October 2011 (UTC)Reply

Thanks! I suspect you're right about minimum intensity, rather than maximum. I"ll see if I can find a reference for that. Walkerma (talk) 03:49, 22 October 2011 (UTC)Reply

Polariscope may be slightly different

edit

Polariscope in Harmsworth's Universal Encyclopaedia vol X (1922) shows sliding quartz wedges rather than rotation of the Nicol prism in the analyser. The 'scope' name may come from the small telescope used to read the vernier scale on the sliding quartz wedges. - Rod57 (talk) 00:35, 20 September 2016 (UTC)Reply

[Modern] Polariscopes may be intended to study gem-stones/solid crystals ([1]), perhaps under a microscope ? - Rod57 (talk) 00:46, 4 May 2017 (UTC)Reply

edit

Hello fellow Wikipedians,

I have just modified one external link on Polarimeter. Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:

When you have finished reviewing my changes, you may follow the instructions on the template below to fix any issues with the URLs.

This message was posted before February 2018. After February 2018, "External links modified" talk page sections are no longer generated or monitored by InternetArchiveBot. No special action is required regarding these talk page notices, other than regular verification using the archive tool instructions below. Editors have permission to delete these "External links modified" talk page sections if they want to de-clutter talk pages, but see the RfC before doing mass systematic removals. This message is updated dynamically through the template {{source check}} (last update: 5 June 2024).

  • If you have discovered URLs which were erroneously considered dead by the bot, you can report them with this tool.
  • If you found an error with any archives or the URLs themselves, you can fix them with this tool.

Cheers.—InternetArchiveBot (Report bug) 19:39, 24 January 2018 (UTC)Reply