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These disks, or lenses, are constructed of thin metal, and are all in communication with each other through the common axis, which is likewise hollow.
The whole system is kept in slow rotary motion by some convenient moving power, and each disk carries up with it, adhering to its surface, a thin film of the liquid; as evaporation when it takes place without ebullition goes on with a rapidity proportional to the surface exposed.
Of this class is Schroder's evaporator D, used in the West Indies, for evaporating saccharine juices at a temperature not exceeding 180° it is worked by hand or steam power.
It is intended specially as a substitute for the teache, and consists of a semi-cylindrical pan h, whose contents are heated by a steam coil d d, connecting by pipe g with the boiler.
On a longitudinal axle resting in boxes on the ends of the pan are a number of disks j, which are rotated by power applied to the crank.
As these disks are alternately exposed to the sirup and to