Although I have not yet returned to the things I said I was looking into, I thought the following might be of interest, regarding "Venetian Ball" (and paperweights in general):The Glass Collector a Guide to Old English Glass
, by Maciver Percival, New York, Dodd, Mead & Company 1919. I have a Second Edition copy, published by Herbert Jenkins Limited, London (no publication date). The text and image I refer to below are the same in both the New York and London editions.
Using the link above, search for "Venetian Ball" then click on the indicators at the lower edge of the display. Or use the page navigation (point and click on the grey page edges) to locate pages 151 & 320. Page 151 is the start of the chapter titled "Curios". The first reference to "Venetian Ball" is on page 152 but it is worth reading from page 151 to get some context in preparation for the section titled "Paper-Weights". Having looked at that section, check out page 320 and the associated image plate for Item 3.
And there we have it ... text on the "Venetian Ball" and an illustrated example to show how it was used in the late 18th / early 19th century.
Well, that was what at least one author told folk almost a hundred years ago!