Chapter VI: MECHANICAL ENGINEERING.--Economy Trials of a

Non-condensing Steam Engine.--By Mr. P. W. Winans,
M.I.C.E.--Interesting notes on testing steam engines. 10331

The Mechanical Equivalent of Heat.--By Prof. De Volson
Wood.--A review of Mr. Hanssen's recent paper, with
interesting discussion of the problem. 10331