DR. HANNEMAN'S MINERAL COLLECTION WILL BE AVAILABLE FOR SALE IN THE NEAR FUTURE
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 Post subject: GIA spectroscope stand sitting at $510 already
PostPosted: Sun Nov 06, 2011 3:07 pm 
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http://www.ebay.com/itm/ws/eBayISAPI.dl ... 27612&rd=1

:shock:

Maybe I need to start making these.


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 Post subject: Re: GIA spectroscope stand sitting at $510 already
PostPosted: Wed Nov 09, 2011 4:29 am 
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Gene, we used to call that the "hand burner." Got to have been the worst instrument the GIA ever produced. We bought two of them where the bolt attaching the light to the base was drilled in the wrong spot so you could not extend the focus unit on the front of the light all the way. Thus it would not focus. And did I mention that the light got so hot it would burn your hands? :lol:

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 Post subject: Re: GIA spectroscope stand sitting at $510 already
PostPosted: Wed Nov 09, 2011 11:42 am 
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I made the mistake of buying one of these units as well.
It is essentially useless.

Now I understand that that bolt IS in the wrong spot.

An OPL is way more reliable....and considerably less expensive.


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 Post subject: Re: GIA spectroscope stand sitting at $510 already
PostPosted: Wed Nov 09, 2011 12:00 pm 
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What's wrong with using a torch or fibre optic, with layers of tissue paper over it if the intensity isn't variable?

I like the "folds down for travel" bit. Has anyone ever used this as a portable piece?

If anyone does get tempted to buy this one, do be careful with Emeralds as this unit is a touch warm.

Does anyone know of someone making the iris bit as a component? I have a few ideas that I want to make.

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 Post subject: Re: GIA spectroscope stand sitting at $510 already
PostPosted: Wed Nov 09, 2011 12:27 pm 
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I like the "folds down for travel" bit. Has anyone ever used this as a portable piece?


The unit is bloody big. Perhaps, portable in a suitcase the size of a "carry-on".
An OPL with a maglight will easily fit in a pocket.....a rather small pocket. :)


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 Post subject: Re: GIA spectroscope stand sitting at $510 already
PostPosted: Wed Nov 09, 2011 4:48 pm 
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Wow it netted just shy of $1,704
Barbra you should sell yours immediately while prices are hot. You used to be able to email the runner up bidder but ebay closed that loophole right quick. :evil:
It is not the most elegant piece of design work I have ever seen. But the merely 18 watt lamp is external to the stone holding and iris derangement so you ought to be able to avoid cooking your fingers and the stone with a little care about leaving the light on except when you are using it.

The heat problem could be solved by removing and selling the American optical 6volt 18 watt microscope illuminator, and replacing it with a single neck fiber optic guide and illuminator. It could be one of the smaller ones not necessarily the usual 150 watter which would probably be overkill.

It would be as easy as pie to cut up a soda can with a scissor and make a band clamp which would allow you to mount either size OPL to the spectroscope holder.

Most people complain about problems not having enough hands to hold the spectroscope and the lighting and the stone. This unit could solve all those problems if its design flaws are corrected as above.

But I wouldn't even recommend spending $500 on one let alone $1704


Iris diaphragms are widely available from optics suppliers. Google Edmund Optics, their surplus alter ego Anchor Optical and also Surplus Shed. (http://www.surplusshed.com)

http://www.surplusshed.com/pages/item/m4182.html


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 Post subject: Re: GIA spectroscope stand sitting at $510 already
PostPosted: Thu Nov 10, 2011 2:03 am 
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How much? (insert a choice expletive). I can't believe someone would pay that much for one. The Eickhorst unit is better and sells for less than £1000 new!

Many thanks to G4LAB for the iris tip off. I've only been looking for 3 years. Nearest I got was a manufacturer in India that wanted a minimum order of 250.

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 Post subject: Re: GIA spectroscope stand sitting at $510 already
PostPosted: Thu Nov 10, 2011 3:27 am 
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You are welcome. Certain things can be a pia to find. Like Methylene Iodide or things with even higher refractive indices. GIA Portable Gemolites.


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 Post subject: Re: GIA spectroscope stand sitting at $510 already
PostPosted: Thu Nov 10, 2011 3:05 pm 
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The stupid thing is M I is easy for me to get. I disolve a little sulphur in it to make my RI contact fluid. I have some recipes somewhere for high R.I. liquids.

I might start another topic on this. Of course these recipes would just be for reference as most of the ingredients are toxic and I wouldn't expect anyone to make them up. :wink:

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 Post subject: Re: GIA spectroscope stand sitting at $510 already
PostPosted: Thu Nov 10, 2011 4:46 pm 
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I just looked up a bunch of them. Most are based on Arsenic Tribromide. (even harder to get than MI) The rest of the compounds you practically need to synthesize yourself.(acetylene tetraiodide, Diphenyl-Diiodo-arsine, Selenium bromide) in the fume hood.


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