Hi: Bruce Wray... I think ablation is the correct word. In surgery it means the removal of tissue. In space craft, the removal of heat. In hot water heaters, the removal of minerals. The rod is sacrificed to keep the minerals from corroding the tank itself. A sacrificial lamb of sorts.
I keep 2 dictionaries next to my Commodore 64. Whenever my children would ask me how to spell a word I always replied D I C T I O N A R Y!!! Alf
escape artist N.S. of Lake Erie