“…It is from these experiments that film boiling from the spheroidal state, or Leidenfrost boiling, takes its name. Somewhat later, in 1827, Perkins (156,157) explained a number of mysterious boiler explosions as the result of the mechanical shock induced by the collapsing spheroidal film-boiling state. Boutigny (25,26,27,28) showed by experiment that Perkins' explanation was correct.…”