It looks like they've replaced them again, since that time.
And couldn't they have told the scientist that it's "Worcestershire Sauce" and not "Worcester Sauce"? Worcestershire is the county, Worcester is the largest city in that county.
At least it's pronounced correctly. Worcester/Worcestershire rhyme with Leicester/Leicestershire, and pronunciation of "Leicester" should be familiar to Americans as the personal name "Lester". ("Wuster" hasn't caught on yet.)
-cester as a suffix to a place name is from the Latin castrum, meaning fort – these were Roman settlements.
Btw. this is one of the prime examples why I think we should use phonetic transscription not only for different alphabets, but also for languages that use latin characters with very different pronunciation (like Irish or Welsh), or even for odd English words like this one.
We do, it's called IPA and Worcestershire is /ˈwʊstərʃər/.
Using something similar for actual normal writing would be difficult though, it would hide all the etymological linkages between different European languages, and even obscure connections within each language.
[edit] Farce. Faaaaaa. Larceny. Lonnie?
Leicestershire in general has more than its fair share of difficult placenames: Ashby de la Zouch, South Croxton, Kirby Bellars, Belvoir, Rotherby vs Rothley, Frisby on the Wreake, Nether Broughton, Kibworth Beauchamp, Glooston* (not sure of this one myself), Wymeswold.
dd → th, ff → f, ll → hl (ish), w → oo gets you most of the way to being understood as a tourist, in my experience. (Though I'm British, so I've heard many of the larger Welsh place names pronounced properly since childhood, via TV/radio etc.)
https://en.wikipedia.org/wiki/Welsh_orthography#Letter_names...
It may be all kinds of wrong, I'm not sure, but it helped keep my sanity (on this one point...)
cester/caster/chester (from castrum, meaning fort/castle) is a very common place name ending in English and the cester variant is almost always pronounced ster. Think Leicester, Gloucester, Worcester.
I've heard plenty of English people pronounce it "Wooster Sauce". I'm pretty sure they're aware of the difference. I think it's just become a standard contraction.
[1] http://www.foodsofengland.co.uk/worcesterorworcestershiresau...