374 Composition forming A Substitute for Portland Stone. 



about one shilling the pint, and add thereto one pint of 

 clear lime water, made from pouring boiling water on lumps 

 of chalk lime in a close vessel till fully saluraied : when the 

 lime water becomes clear, it is proper to be added to the oil 

 as above mentioned, and on their being stirred together 

 they will form a thick oily mixture, or emulsion, proper to 

 apply upon the moulds. 



In forming the side or jamb of a chimney-piece, the 

 mould is to be first half lilled with the sand-lime and plaster 

 composition, then two wires wrapped round with a thin 

 layer of hemp, and which wires are nearly the length of 

 the piece to be moulded, are to be placed in parallel lines, 

 lengthways, in the mixture or composition in the mould, 

 and afterwards the mould is filled up with more of the com- 

 position, and if there is any superfluous quantity, it is to be 

 struck oflF with a piece of flat board. 



The lid or top part of the mould is to be then placed 

 upon it, and the whole subjected to a strong pressure from 

 weighted levers or a screw press. The composition is to 

 remain under this pressure for twenty or thirty minutes ; 

 the precise time necessary may be known, from examining 

 a small specimen of the composition reserved purposely to 

 determine the time it requires to harden and set firm. 



The sides of the mould are to be held together by iron 

 clamps and wedges. 



The wires above mentioned answer a double purpose, by 

 giving strength to the jambs, and retaining the whole mass 

 together in case it should at any time be cracked by ac- 

 cident. , 



The chimney-pieces may be made either plain or fluted, 

 according to the mould, and when moulded, they' are fi- 

 nished off by rubbing them over with alum water, and 

 smoothing them with a trowel and a little wet plaster of 

 Paris. 



A common plain chimney piece of this composition is 

 sold at only seven shillings, and a reeded one at twenty- 

 eight shillings, conijiletely fitted up. 



Certificates were receive J from thef'lloicing Persons. 



Mr. George Smart, of Ordnance \Vharf, Westminster 

 Bridge, who had tried these chimney-pieces for three years, 

 ^nd found them a valuable article. Mr. J. Willoughby, 

 who had fitted-up nine rooms with these chimney-pieces, 

 in York-street, Broadway, Westminster, Mr. William 

 Simpson, Hackney- road, who had funished four rooms 



with 



