Chapter IV: ENGINEERING.--Fuel and Smoke.--By Prof. OLIVER LODGE.--The

second and concluding one of these important lectures.

Gas Engine for Use on Railroads.--The application of six horse
power Koerting gas engine to a dummy locomotive.--1 illustration.

New Gas Holder at Erdberg.--The largest gas holder out of
England.--3 illustrations.

Tar for Firing Retorts.--Simple arrangement adapted for use in
ordinary gas retort benches; results attained.--1 illustration.

The Anti-Friction Conveyer.--An improvement on the screw of
Archimedes; an apparatus of wonderful simplicity and efficacy in
the moving of grain.--2 illustrations.

The Retiro Viaduct.--Combined iron and stone viaduct over the
river Retiro, Brazil.--5 illustrations.

Western North Carolina Location over the Blue Ridge.--Interesting
instance of railroad topography.--1 illustration.