CURE FOR. DAMP WALLS. - 141 



I, the ash-pit, the bottom of which is a little arched to. 

 ward the farther part, so as to give it greater depth. 

 K, K', K", the castors of the ash-pit. 

 Fig. 5. The profile or vertical section of the fire place. 



A, the mantletree. 



B, the anterior plate or regulator. 



E, D, the posterior plate, of cast iron, curved so as to 

 leave an opening for the smoke four inches broad by sixteen 

 or at least fourteen long. 



It must be observed, that this plate does not reach quite 

 to the top, and that the line is continued by loose bricks, to 

 facilitate the passage of the chimney sweeper ; in addition 

 the interval E is filled with a mixture of powdered charcoal 

 and mortar or clay. 



G, shews the shape of the grate into which the turf or 

 charcoal is put. 



Fig. 6. P, a pair of cranesbill tongs. 



VI. ,, . 



Method of curing Damp Walls, by the Application of a 

 Composition newly invented by Mr. Charles Wilson, 

 of Worcester Street, near Union Hall, in the Borough,* 



SIR, 



JL BEG leave to lay before the Society of Arts, &c. a Cement to 

 cement, which, I trust, will be found of great utility in ^ °^* 

 curing damp walls, in flooring damp kitchens, and for va- floors, 

 rious other purposes, where the prevention of wet is ne- 

 cessary. 



This cement when put in water will suffer neither an in- and join stone 

 crease nor diminution in its weight : and it has the peculiar or mar 

 advantage of joining Portland stone, or marble, so as to 

 make them as durable as they were prior to the fracture. 

 I have the honour to be, 



Your very humble servant, 



CHARLES WILSON. 



* From the Transactions of the Society of Arts, who voted a 

 premium of ten guineas to the inventor. 



Receipt 



