HORIZONTAL ROTARY RETORT.

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down, and one with the door in its place, or shut.The circular ring seen in this design, at the top ofeach retort, which rests on iron-bearing bars, theextremities of which are let into the end wallsof the furnace, serves to support the roof of theretort by means of bolts, proceeding from the innerside of the roof. This arrangement is likewiseshown in the section, fig. 1, plate II: 5 * At thebended part of the perpendicular pipe H, fig.1, plate II., is seen a bonnet, or cover, which closesan opening made into the pipe II, through which,by means of an iron rod, the loner extremity ofthe pipe II, may, from time to time, be examined,to guard against an incrustation of decomposed taror carbonaceous matter that might happen to accu-mulate in that part of the pipe. The upper partof the pipe II, above the bonnet at the bended part,requires no examination.

b, fig. 2, and 6, fig. 5, plate III., is the flanch of the

* A more economical method of supporting the roof of the retorthas lately been adopted by Mr, Clegg. It consists in giving the roofthe form of an inverted arch, supported on the Catenaria plan, bytwo bolts only, placed at the most elevated extremity of the arch andsecured to an horizontal beam.