98
MODERN GASWORKS PRACTICE
was the Klönne. In this system the interchange of heat was brought about by the employment of special blocks as sliown in Fig. 41. In the Tatest Gibbons and Masters’ system slotted fireclay boxes, moulded out by machinery, are erected side by side in vertical tiers so that no straight joints occur. This system has the advan-tage of being particularly simple, only necessitating the use of the two-standard blocks (Figs. 42 and 44), whilst the wall-thickness separating waste gases and secondary air is reduced to 3 inches with. complete immunity from short-circuiting.
Fig. 43.—Gibbons & Masters’ Regenebatok System.
In Drake’s system rectangular fireclay tabes (Fig. 45) are employed, the waste gases travelling backwards and forwards through, tliesc, whilst the secondary air traverses upwards around the outside of the tubes. The tubes are placed end to end, all joints being covered by bricks for the purpose of avoiding by-passing. If through the movement of brickwork by-passing does take place, it can at once be seen and remedied through the front wall of the regenerator. This is done by means of a “paddle” and patchmg material, in the same way as with. a cracked retort. As regards th.e supply of secondary air, eacli vertical section is absolutely distinct from