Question Author
Thankyou, Lil O' Lady, for your most helpful, and interesting suggestions. I will try to contact the Museum for a definitive answer. However, I do not think it is a mis-reading of "iron beater", since a Google search for the term produced a number of sites referring to different people in censuses (mostly US ones) described as iron heaters, and also a "Survey of 230 Male Wage-earners In Ohio, 1879, Reported in the 3rd Annual Report of the Ohio Bureau of Statistics of Labor" recorded 1 iron heater, as well as 1 iron & steel temperer, 1 iron melter, 2 iron boilers, 2 iron workers, and 12 iron molders, but strangely, no iron beaters; though when I googled that, it did appear as an occupation in 2 sites referring to UK censuses.
Bookworm 1