Dear All,
I've attempted to post the original photos taken in the 1980s (the earlier link doesn't work as I've suspended the website due to image piracy on the Facebook local groups).
My jpegs are too big to post- I'll try re-scanning on lower resolution and give it another go.
The main entrance with the curved fanlight, prominent in the engraving, was on the Scott Street elevation The photos show the bit extending to Catherine street which appears to have been added later.
Best wishes,
Wincolmlee
PS: I understand Vulcan was the Roman god of fire, blacksmiths and various other related trades, hence to common generic use in names of foundries and similar.