Frank - will look for the pic, which is not vital for this query. I actually dug it out a little while ago for some newly-discovered relatives of mine. It turned out that the chap in the picture (a melter in a glassmaking chair), Arthur Carney, was a very distant relative by marriage of mine! I knew him well and he never mentioned it - probably he didn't know either.
Later - Have just noticed that the picture IS relevant. Have found a rough copy of it (I think the original was a little better) and yobunnied (is that a verb?) it. Now I don't know how to get it on such an old posting from which the "edit" button has disappeared. Help, please, Frank. Also many thanks for putting the link up for me. I was too idle to remember how to do it. Old age is a good excuse for a multitude of sins!!