|0Q METHOD or SECURING DECAYED TIMBERS, 



earfh's furtace, and its fpecific gravity ; in the fame way as 

 we would afcertain the denfity of the oxygenous or azotic at- 

 mofpheres, or one of hidrogen, at any given height, having 

 the like data. 



It has been a matter of furprife to me, that moft or all of 

 my effays pubh'Qied in the volume above mentioned, have been 

 copied and circulated in one or other of our periodical publi- 

 cations, except thofe twojuft mentioned, which appear tome 

 by far the moll important, and which feem too to have been 

 cojifidered as fuch by the foreign joumalifts. 



I am your's, &c. 



J. DALTON. 

 Manchefter, Aug. 22, 1 803. 



XII. 



Cheap and efflSliial Method offecurin^ Beams of Timber in IJnufes 

 or elfcwhere, uhich have been injured hy the Dry Rot, or arc 

 decaj/edbj/ Time. By Mr. James Woart.* 



Bafy method of W HERE the ends of the girder are decayed by time, or 

 timbcr3^n"uUd-'"J"''^'^ ^y ^^^ ^''X ^'^^> th^y are often taken out, and new 

 ings, &c. ones pat in their place, at a great expenfe : and if the dry rot 



is in the walls, (he ends of the new girder will be in danger 

 of it again : fuch was the cafe at Eltham, in Kent, where in 

 one houfe there were three new girders lo one floor in the fpace 

 of twenty years ; whereas my method will be found infallible, 

 executed at much lefs expence, and not fubjed; to the dry rot, 

 becaufe the end of the girder may be cut off clear from the 

 wall; and if an air grate is put on the outfide, fo as to admit 

 air to the end of the girder, it will remain fafe from injury. 



Plate IX. Fig, 2.t — A, fliews the end of the decayed girder, 

 with the braces applied upon it. 



• Memoirs of the Society of Arts, 1802. A reward of twenty 

 guineas was awarded to the inventor, who, in an Jntrodu£lory let- 

 ter ftates, that by the iron braces, of lefs coft than 201. he fecured 

 the houlb of Hannege Legg, Efq. at Putney in Surry, which could 

 not have been done by new beams without lofs, derangement, and 

 jfharges to the amount of eight hundred pounds. 



t There are two plates in the Tranfaftions, the fecond of which 



forms 



