Richardson's patent 1873:- combined tube and tubular vertical boiler viz:- (a) Model half section

Richardson's patent 1873:- combined tube and tubular vertical boiler viz:- (a) Model half section, scale 1:8, on wooden base and (b) Drawing sectional, with description, glazed and framed in Museum

This is a vertical boiler patented by Mr. J. Richardson in 1873, in which considerable tube surface is introduced. The shell of the firebox is much larger than the grate, and from the space between them, nearly vertical tubes pass upward to the crown of the firebox. These tubes connect with the water space at each end, so that a good circulation of water is secured. From the crown of the firebox the hot gases pass through nearly vertical tubes to the top of the boiler, where by a chimney with a large conical base the waste gases are collected and carried off. In this boiler, therefore, the two sets of tubes act in the reverse manner.