It is with great sadness I'd like to announce Dr. Hanneman passed away on December 12, 2020. His legacy will live on forever!
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PostPosted: Sun Dec 16, 2007 1:33 pm 
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Hi,

Last night we talked about the dichroscope and I made an error when I talked about vibrational directions.
I said that one ray vibrates left to right (in uniaxial gems) and the other perpendicular to that as in a handshake. The latter is wrong.

As I am always looking for weird ways to explain things I should have known better.
The vibration of the extra-ordinary ray vibrates not like a handshake but in and out of the plane, and your hand should be moving as in the "walk like an egyptian" dance by the Bangles.
The horizontal movement can be seen in the ketchup song. they start the shake on the "asereje" .. http://nl.youtube.com/watch?v=XubVpeq4E20 for those who missed the 2003 summer rage.

So, ordinary ray is ketchup and extra-ordinary ray is egyptian.

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PostPosted: Sun Dec 16, 2007 2:11 pm 
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Uhhh, is it just me, or was that not the best analogy to use? After seeing that, now you've got me really confused. :smt017

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PostPosted: Sun Dec 16, 2007 3:09 pm 
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Hi,

If the vibrational direction would be in the direction of a handshake and the propagation direction is up ... it would be a longitudinal wave, not a transversal wave.

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PostPosted: Sat Dec 29, 2007 11:10 am 
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Hi,

As a reminder: there will not be any organized chats this weekend (but feel free to come anyway).
In Januari we start from the beginning again during the Saturday chats.

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