Exploration of greenland

July, 1883,]

lrxcplorat'ton of Grecrdand.

5

late up.n meeting these tremendous stresses by weight and thickness of metal, but that the engineer must rely principally, if not solely, upon complete and certain drainage of the pipe at all times as the only memos of' satbly handling steam in long pipes, such, especially, as are now coming into u~e in the heating of cities by steam led through the streets in m~dergr(,md mains. The thets here presented have been, to the writer, something of a revclatlon, and have seemed to him to possess mmsual in,terest and importance to the engineer using stemn m~der such conditions as are here refl, rred to. It is a ~,lct which has long been well known, ~hat these suddenly produced pressures are often very great. The writer has occasionally, C,,' many years, l