Another job you may not want to do. Boiler riveter at the Baldwin factory

John K. Brown, The Baldwin Locomotive Works 1831- 1915, John Hopkins University Press, 1995

 A team of men was needed to rivet boilers for steam locomotives. The man on the left takes red hot rivets from the furnace and passes them to the man kneeling inside the boiler.  That man, "the holder-on" inserts them in the hole and holds them there for the man on the right to hammer or peen them into a round head. Hot loud work.

 Not sure what the guy on the top left is doing.