Bernard, you have posed an interesting question within a wider (fascinating) topic. In answer to your question: “Does anyone know if this is the first publication of this error?” I really can’t say. I haven’t seen the 1978 magazine article, but I do have Lattimore’s 1979 book "English 19th-Century Press-Moulded Glass".
I notice that Murray in 1982 ("The Peacock & the Lions") hedged her bets by placing Sowerby’s “iridescent glass” in “the last two decades of the 19th Century” (p 40) and also “in the twentieth Century” (p 54). Nothing like keeping your options open, eh?
There was certainly published information at the time, regarding the introduction of Carnival Glass, and its correct time line. Larry Freeman in his "Iridescent Glass, Aurene, Carnival, Tiffany" (published 1956,1964) had the dating as 1910-late 1920s. Sure, that was just a little late, but we can forgive him the odd year or two :-)
There were also Carnival Glass associations in the USA (the Society of Carnival Glass Collectors, established 1964, the American Carnival Glass Association, est. 1966 and the International Carnival Glass Association, est. 1967) as well as a thriving community of collectors in the UK that formed into an organised club in the early 1980s.
It’s possible to see why Lattimore had his date wrong, if we assume that he didn’t look beyond the Irish Sea. If we assume that he was only looking at the UK output of Carnival (ie Sowerby) then he possibly studied items that were made using old moulds (such as the Diving Dolphins, which was originally in production in the 1880s). However, the little Carnival Glass cream jug that is illustrated in "English 19th-Century Press-Moulded Glass" is actually a later item from Sowerby. Its catalogue number is 2377 (known to Carnival collectors as “Crosshatch”) and it was first introduced, I believe, in the early 1900s. The greater part of Sowerby’s Carnival output was actually made in patterns from the early 1900s (their item that is probably seen most often is Chunky aka English Hob & Button aka Sowerby’s 2266). The Diving Dolphins, Daisy Block Rowboat, Covered Swan and the Royal Swans are the main (and superbly wonderful) exceptions to that rule.
However, Lattimore did refer on page 153 (in "English 19th-Century Press-Moulded Glass") to “the ubiquitous iridescent glass produced at the end of the century and now known by the American name of carnival glass…………. Prices for this type of glass are affected by the demand from the United States”. So he was aware that the USA was driving the market. Certainly the information regarding the time-line for Carnival was in the public domain at that time.
On the wider subject of published erroneous information, I guess it’s just one step in the process of how we learn. We all make mistakes - sometime they’re excusable, sometimes they’re not. Unfortunately, when something is in print, it is often very difficult to correct it, should it be proven wrong. And (a pet peeve of mine) it is so frustrating to see mis-information being repeated as the truth, simply because “it’s in the book”.
One interesting piece of wrong information perpetuated for a considerable length of time in the Carnival Glass world, was the case of the Jain Hand and Fish vases. It was written back in the 1980s that these were made in Czechoslovakia - by the Jablonecky Industrisklo works (hence Ja In). In fact the items were made by the Jain Glass Works of Firozabad, India. It took quite a bit of work to get the correct facts in the public arena.
There are plenty more examples of similar “mistakes” in the published literature today.
Thanks again for an interesting and thought provoking “thread”, Bernard.