|7(J FRAMED TRUSS, 



V. 



Letter from Mr. J. C. Horn blower, defer ibing the framed 

 IVork by which the Roof of Clapham Church was raifed to its 

 original Situation, without difturbing the Interior of the Build- 

 ing, %c. 



To Mr. NICHOLSON. 

 Dear Sir, 



Framed trufs by &T ^jj ^ e a p] ea f ure to you I know to record the productions 

 ofciupham of genius or fancy in your valuable Work, and therefore I 

 church was have no hefitation in prefenling the inclofed for that purpofe. 

 »ifed, &c It Js the ; nvention of Mr. Watkin Bloore, one of the part- 



ners of Fothergal and Co. carpenters at Clapham, and was 

 invented to raife the funk roof of Clapham church ; and its 

 application to the purpofe intended, exhibits at once the means 

 and the end that was to be accompli (lied ; as by it the roof 

 was raifed and fecured in the fame procefs, without incom- 

 moding the building with ihoors and fcaffolds, which muft 

 have occafioned confiderable damage to the furniture of the 

 church. 



The fhaded part of the drawing, Plate X. (hews the trufs, and 

 the lines behind it the conftruclion of the roof. The middle piece 

 in the trufs marked A, is joggled into the king-poft of the roof, 

 and the two fcrews put into action raife it up, and with it 

 the whole of the middle or funk part of the roof, all which is 

 eafily comprehended by the drawing. 



The drawing, Fig. 3, (hews an improved mode of con- 

 ftru&ing the trufs, by the riders A AAA being framed over the 

 principals B B, by which the raiting fcrews are more firmly 

 iupported in elevating the queen-polls C C in the roof. 



This muft be a valuable experiment in the art of carpentry, 

 which, confidering how little fcience of it falls to the lot of 

 Us pofleflbrs, cannot be too much regarded. 

 I am, Dear Sir, 



Your very obedient fervant, 



J. C. HORNBLOWER. 



Remark* 



