ABSTRACT
The second half of the nineteenth century opened, as regards boilers, with the Lancashire type in the aseendant. The vogue that the Lancashire boiler enjoyed is due to the fact that at no period was there a sudden demand for higher pressures, so that it was possible to satisfy increasingly exacting conditions as they arose by the improvements just indicated. Several variants of the boiler have been introduced; one such is the “Yorkshire” boiler patented by William Herbert Casmey in 1906; in this the flues incline upward and increase in diameter from front to back, the diameter of the shell being proportionately greater and the length less than in the Lancashire type. A water-tube boiler that created much stir in its day was that patented between 1861 and 1878 by Loftus Perkins, grandson of the more famous Jacob. The coil boiler is one that has had a fascination for inventors.
