 Sir Clement apparently guided many of these developments; though he probably did not personally benefit from them financially, his sons probably did.Sir Clement is certainly to be credited with the practical application of the reverberatory furnace (or cupola) to several metallurgical processes.Until the introduction in the late 18th century of the foundry cupola (which is a sort of small blast furnace), his air furnace was the normal way of remelting pig for foundry purposes.