s Fig. 30. — 1 THE COWLES BOILER, 1880. V. 3. Patent No. 396,545. jj (fig. 30), however, does not allow as large a proportion of grate surface to room occupied as Thornycroft’s. Fig. 28. THE THORNYCROFT, 1894. The “ Daring ” Type. to increase the amount of tube surface between the points of… … Fig. 29.— TnE ALLAN STIRLING BOTLER, 1888. Trade Circular. \ Allan Stirling, who used the closed-end unit in 1887, adapted the unit designed by Rowan in 1865 to a new construction Fig. 32. — THE MOSIIER DOUBLE BOILER, 1890. (fig. 29), leaving out the opportunity for definite circulation Report…
