Jg2r METHOD OF SECURING DECAYBD TIMBERS. 



Eafy method of ten, and the beams were funk three fourths of an inch, and 

 fee uring decayed prejiing againll the wall for fupport; if there had not been a 

 ings "re". "' ' large cornice underneath, fupported by brackets, the whole 

 roof muft have fallen. 



To put them in order, I firft put (hores or fupports under 

 each end of the two beams, on which the double roof lay, 

 and then forced the four (hores at once, for the fecurity of the 

 roof, the work, and men. The iron levers, C, were then 

 prepared, let into the templet, and fixed on each fide of the 

 beam, on the pins D, projeding from the collar E, bedded in 

 the beam, about two feet from its end. When the whole ap- 

 paratus was ready, on fcrewing the nuts on the upright irons 

 G, at the extremity of the levers, the beam was raifed to its 

 proper height with great eafe, although it was fuppofed there 

 was above two tons weight on each beam, on account of the 

 lead gutter, and gutter-beam betwixt the double roof, and the 

 rich ornamented ceiling attached to the joift, which was not in 

 the leaft deftroyed except where the iron collar E was fixed, 

 which was put up from the under fide by cutting the ceiling the 

 width of the collar. Thefe beams were fo decayed, and fo 

 hollow, that the common method of bolting plank on each fide 

 of the beam would not have been fafe ; and if it could have 

 been executed, the new planks would have been fubjeft to the 

 dry rot, and the roof Hill in danger, which is now prevented, 

 as the iron is not affecled by it. The beam-ends were cut 

 clear from the walls, and the beams are fufpended by means 

 of the iron levers, whofe feet reft on the templets of the walls. 

 An air grate was made, on the outfide of the wall, to admit a 

 current of frefli air to the ends of the timbers. The roof is 

 row much fafer than when originally made, as the timber is 

 fecured from decay ; and, owing to the collar E, the bearings 

 are now two feet fliorter at each end of the beam ; the bearing 

 on each beam being now, in the whole, four feet fliorter than 

 in its original llate. 



After ^the beams were brought to their proper height, and 

 the levers and fcrews adjufted, fcrew-bolts were put into the 

 timber, through holes purpofeiy left in the lever, betwixt D 

 and F, and the whole work thus perfedliy fecured. 



At the other end of the girder, M, Plate IX. is fliown an- 

 other method of fupporting timbers, where the ends are de- 

 cayed. 



The 



