Black balls are black balls whatever interpretation one wants to put on them. One of the nautical variety was not less than two feet in diameter and placed 6 feet vertically apart where they could best be seen. As their meaning was "Not under Command" I always thought this was badly worded, and should have meant the ship did not have control of its steerage way course speed and direction, and really meant for others to give a wide berth to. As regards evaporators and distillers it was only in latter years that I saw used for human consumption. The only steamship I was on she had superheated elements around the tubes which were taken out as probably the same reason as you state, rust and scale and this was done at sea by the chief and myself when time permitted. The back end of a boiler is not unknown to me and can think of better places to be. This is probably what aggravated the chiefs mdical condition and he died in Singapore. He was a man in his very early fourties. The water consumption on this vessel was huge and for domestic purposes it was a fourty gallon of water placed on the boat deck. Every port on passage was marked as a probable port of refuge, just to be able to top up with water. When today with all the modern aids it is hard to remember all the different types of hardship that used to exist the mind remembers the finer things in life and one tries to forget the bad ones. People used to be on a ship to try and correct all faults as well as coping on day to day problems. Nowadays it is call in someone else, the same people probably having less knowledge than the ship staff of old. If it was ever possible to get an unbiased report that doing away with ships crew, especially machinery which required continuous maintainance, was cheaper to call in shore labour I will be very surprised. Cheers JS PS The only boiler mounting I can remember with certainty is the Salonometer Cock, the first word probably spelt wrong , the second being correct. Cheers JS