_EVAPORATION, HEATING AND DRYING._
Theory of evaporation -- Boiling point and vapour-pressure --
Consumption of heat in evaporation -- Heat-units -- Mechanical energy
of heat -- Evaporation by “multiple effect” -- Vapour-pressure of
atmospheric moisture -- Wet and dry bulb thermometers -- Heat and air
required in leather-drying -- Loss of heat by buildings -- Quantity of
heat given by steam and hot-water pipes -- Screw-fans for drying --
Centrifugal fans -- “Turret” dryer -- Downward ventilation --
Arrangement of steam-pipes -- Hot water pipes PAGE 420