IJ^6 Account of the Improtjement In Cir$ular ArchiteElure. 



required to form afliiOi eclge, fuch as the cheek of a window 

 or door, it can be done by cutting down the clumps into half 

 clumps, as reprefcnted by the dotted line X,X, fig. 9. Ra- 

 viels, rabbits, grooves, &c., and returns of corners, elliptics, 

 &c, mud be fpecifically moulded on the fame principle ; or 

 girders, ties. Sec, may fecure any variation by means of fuit- 

 able caft iron clamps, modified according to the particular 

 contingency. 



Fig, 7. a fcifliion of a well or pipe. Sec. the furfacc of the 

 circle in view being put together with clumps fig. 2, the 

 male fide a pointing outwards. 



Fig. 8. (liows the plan of a folid column formed of elon- 

 gated clumps of the kind a, fig. 4, the male points outwards 

 being in view. As this fame modification contrails the circle 

 to a fmaller column, in that cafe fewer pieces will be required. 



Fig. 9. is a perlpeAive view, (liowing a fegment of the work 

 (part of a circle) formed out of fix clumps laid in their order 

 from figures t and 2, the bottom courfe having a blank fide 

 as defcribed fig. 6. 



P'ig. 10. part of a clump main pipe, fliowing the manner of 

 flaunching in a caft iron branch piece in order to join the 

 fame to a branch main. 'J'his can be performed with the 

 help of an iron rim (joggled) as reprefented in fig. 11 ; or it 

 can be fitted to blank fides next the flaunch, and the oppofite 

 end of the bolt can be counter-funk into perforated clumps, 

 having the prominent ends fitted with a male and female 

 fcrew, in order to fiide the tlaunch piece in or out as occafion 

 demands. 



Fig. II. a caft iron rim indented or joggled to fit a courf& 

 of clumps as reprefented on the lurface in view, in order to 

 admit the flaunch to flip in and out as required on its fmooth 

 furface. 



Fig. 12. a plain caft iron flaunch for joining a clump main 

 in fuitable lengths to be orcafionally taken down': they may 

 alfo be laid in lengths by means of a key clump, having two 

 jnalc fides to have the joints bnndcd with a hoop. 



Fig. 13. ftiows the mode of fitting the prominent point of 

 the flaunch bolt by means of a male and female fcrew, fo 

 that the flaunch piece may be Aided into or out of its birth 

 at option_, without hanging on the flaunch plate or joins. 



XXV. On 



