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Interestingly Neuwirth says on page 277 Farbenglas I:

'The history of uranium glass lies in obscurity'.

  Pictured is my candidate for Chameleon glass

The example Neuwirth W. gives in Farbenglas I of Chameleon glass page 179 is actually an almost citrine coloured  oily looking (slightly opalescent looking although I don't think it is opalescent, but very transparent still) jug in a yellow transparent glass .  It is from J. Meyr, Adolfshutte before 1837.  It's actually described as yellowish green cut glass.
But it looks slightly oily slightly opalescent citrine colour in the photograph.

Very different to your goblet colour here:
https://www.glassmessages.com/index.php?action=dlattach;topic=73090.0;attach=262544;image

It is actually very like my little toilet bottle/lamp base here although perhaps looking a tiny bit more yellow than my bottle appears in my photo:
https://www.glassmessages.com/index.php?action=dlattach;topic=73090.0;attach=262542;image

Neuwirth gives a  description on page 276 :

' The color glass specialists at Adolfshutte succeeded with this creation prior to 1837.  J. B. Eisner lists a group of "chameleon" glasses which contain uranium and chromium oxides (Blau, 1940, p.17)'.

From my reading this is an actual documented example of what was called 'chameleon' glass.

  Yes, the "better than the English" I think relates to purity. Reply#111 In your QV thread mentions pitchblendes "nature and prejudice to copper ore". GILLINDERS TREATISE  in relation to Victoria yellow or Topaz states at the end [ page 107 ] "by adding the copper, the color may be made as green a tinge as you wish it". To get a good yellow I would think the copper would have to be refined out or at least kept to a minimum. Whitman mentioned in the letter probably a wholesaler and may be sourcing  uraniumm from Bohemia.

  The processing scheme being set up in Bohemia mentioned in your QV thread#127, makes perfect sense to me considering uranium is being used in a wide array of products usually as a pigment from fine china to wallpaper. Purity matters, there is money to be made here.

 The information in your QV thread #146 stating that Harrachs normal output was lead based combined with the statement in THE PRACTICAL MECHANIC AND ENGINEER 1845 that there is only one glassworks in the region making lead glass tells me that Harrachs would be an obvious contender if indeed the QV bowl had a secret Bohemian lineage.

  The Waiter Spiegl link has blown my mind on two counts. First is the Wintenburgh opaque yellow tumbler on page 17, this color is an excellent match to Steubens Mandarin Yellow, of which probably half of examples extant have spontaneously cracked, very rare.

I am not a chemist and don't really understand all(any!) detail however I think Spiegl said there were two or three suppliers of Uranium oxide and that for some reason they were different to each other producing maybe different colours of uranium glass? Green and yellow?

I hope I was right on Harrach using lead glass but I'm not entirely sure!

REALLY interesting that the Steuben Mandarin yellow has examples spontaneously cracking.  Is this an example of Pellatt's uranium glass batch that all fell to bits and had to be entirely replaced at the cost of the Falcon Glassworks?  Or is Steuben Mandarin not uranium glass?  It does seem that yellow glass was difficult to make from reading W. Spiegl or rather if I've understood it correctly (not a given).

hmmm.  That violet flask is so similar in colour and design one could almost say it came from the same source as this one in Walter Spiegl's publication - page 24:
http://www.glas-forschung.info/pageone/pdf/farbglas.pdf

Love those!