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[Page 66]
Pieces in the way, the withdrawing the Sediment will be a tedious and difficult Operation and the Scurf cannot be effectually scaled from off the inside of the Boiler, without taking it to pieces .
How often this may require to be done must depend entirely on the nature of the Water, with which the Boiler is fed and can only be learned from experience.
The Body of the Great Boiler is Cylindrical forty three feet four Inches in diameter and
[Page 67]
Six feet long, through this Boiler in direction of its Axis, there go fixed twenty five Copper Tubes 3 Inches in diamr., which are fixed into the Boiler at each End, in such a way that the highest Row is about three Inches below the surface of the water when the Boiler has its complement of Water in it.
The Caloric and heated Air from the Fire Place and small Boiler, passes through these Tubes into the Chimney which is enlarged at its Bottom to embrace the Whole of the five and twenty Copper Tubes.
