I think I might have got to the bottom of this.
This is long - bear with me. It's a possible explanation of why assumptions have been made that this uranium glass bowl was made in England and also by Whitefriars. In conclusion, I think it has all been based on assumptions/possible mis-reading of information available, and I do not believe this bowl was made in England by an English glassmaker in 1837.
1) I mentioned Cornwall mines producing uranium earlier in this thread. I decided to search a bit further.
In searching I came across a book written in 1817 by H.C. Gill called ‘An Historical Survey of the County of Cornwall’ where he mentioned uranium being found in pitchblende in mines there. He mentions in his book, in that chapter, that it is used for colouring glass and gives the colours as Apple Green, Brown and Emerald Green. See page 269
https://www.google.co.uk/books/edition/An_Historical_Survey_of_the_County_of_Co/fflRAQAAMAAJ?hl=en&gbpv=1&dq=an+historical+survey+of+the+county+of+cornwall+uranium&pg=PA269&printsec=frontcover2) It seems this information had already been found in the glassworld as in
Journal of Glass Studies
Vol. 37 (1995), pp. 140-145 (6 pages)
Published By: Corning Museum of Glass
I came across an article by F. Peter Lole, Didsbury Manchester, who mentions this book by HC Gill and the information on uranium in the book.
https://www.jstor.org/stable/24190783F. Peter Lole,
by my reading of his article, makes the assumption that H.C. Gill is familiar with glassmaking because of the way Gill mentions the glass making in his chapter but then makes no further recommendations as to the use of the pitchblende.
It is my opinion that Lole’s article also implies or seems to make a connection with uranium glassmaking in England at that time. Or at least that the way he's written his information could be 'misconstrued' like that.
I wondered whether actually H. C. Gill was not in fact familiar with glassmaking at all, but had read that information about the uranium glass colours elsewhere in earlier literature and so included it in his book in ‘passing’ if you like.
However, as Lole did, I also wondered why Gill mentioned the pitchblende mines as he didn’t give any other explanation for it’s use.
3) I then came across a long article written in 1917 (see page 165 and 166)
copyright 1915 Society of Economic Geologists, Inc. Economic Geology, v.10, pp161-171
https://www.aditnow.co.uk/documents/RESUGGA-Mine/South-Terras.pdfThe Pitchblende of Cornwall, England – R.A.F. Penrose Jr.
It seemed to me Penrose was intimating that Pitchblende was a substance that miners/smelters did not want due to it’s ‘nature and prejudice to copper ores’ , therefore the reason for including it in Gill’s book might have been so it was known which mines produced pitchblende and therefore were ‘not valued/useful’ at that point.
I may have misunderstood this, but anyway because of my understanding of reading the Penrose article, it led me to investigate further.
I wondered whether Gill had ‘paraphrased’ his casual info on the use of Uranium in glass producing Apple green, Brown and Emerald green from somewhere else.
4) So I looked back to see if there was information earlier than the 1817 of Gill’s book, from Klaproth.
According to The Estimation of Uranium in Colored Glasses , Sheilagh Murray and John Haggith, pp184
https://www.jstor.org/stable/24188153In 1786, M. H. Klaproth Professor of Chemistry at the University of Berlin, isolated from pitchblende a new substance called uranium.
This led me onto finding the Pantalogica dated 1813 (i.e .4 years prior to Gill’s book and written whilst Klaproth was still alive (d.1817):
Pantalogica Vol VII U- ZYT dated 1813 - Printed by T. Davison, Lombard-Street, Whitefriars
Under ‘URA Uranium’
It discusses M Klaproth and uranium oxide and colours and in writing out Klaproth’s actual mixtures it mentions the colours ‘apple green, brown and emerald green’:
https://www.google.co.uk/books/edition/Pantologia/Jco6AQAAMAAJ?hl=en&gbpv=1&dq=uranium+glass+finger+glass&pg=PP200&printsec=frontcoverConclusiona) I surmise that F. Peter Lole’s possible assumption, that H. C. Gill writing of Cornish mines in 1817 knew something about uranium glass being produced, was probably not correct.
b) I think Gill had read the information from Klaproth and copied/re-wrote it in his book as a descriptor for what the Pitch blende could be used for in the absence of anything else.
c) Please also take good note of where the Pantalogica dated 1813 with the information in it from Klaproth regarding the use of Uranium oxide in glass was printed! It was printed by
T. Davison, Lombard-Street, Whitefriars
So this MIGHT go some way to explaining the assumption that this bowl was made by Whitefriars?