COMMODIOUS HOUSES WITH EARTHEN WALLS. 59 



consequence been several tiroes, both publicly and privately, 

 called on to communicate my observations thereon; I have 

 been led to consider, that the best mode of generally com- 

 municating what I know on the subject would be through 

 the medium of the Society of Arts &c. I have accordingly, 

 by the waggon, forwarded a case containing a model of my 

 frames and apparatus for performing the work, with every 

 particular in my power to give, for the information of any 

 persons inclined to build in that way; and they will, 1 hope, 

 be found worthy a place in the collection of the Society. 



To such as may be inclined to see specimens of this work, ~ om * near 

 i • /••/>!• /» London, 



and may not have an opportunity or going far distant from 



London, I can recommend a house and other works built, & 



and some of them inhabited by my brother, Mr. William 



Salmon, Builder, at Henley Hill, near Barnet, Herts. 



I have the honour to be, 



The Society's and your most obedient servant, 



ROBERT SALMON. 



Description of the Engraving of Mr. Salmons Method of 

 building Pise or Earthen Walls. 



Fig. 4 of plate II is a perspective view of the apparatus or Explanation 

 moulds, in which the earths are rammed to form a wall. ie P* 

 The mould consists of two long planks Ff, twelve feet long, 

 twenty inches broad, and one inch thick, each made in two 

 breadths; they are strengthened by several pieces of wood 

 nailed across them. Holes are made through these pieces 

 of wood at top and bottom, to receive iron bolts, which hold 

 the two boards parallel to each other, fourteen or sixteen 

 inches asunder, which is the thickness of the wall intended 

 to be formed between them. The bolts have a large head 

 at one end, and a key passes through the other, to keep the 

 planks together. When a wall is to be built, the foundation 

 is laid in brickwork, which is carried about nine inches 

 above the ground, upon this brickwork the planks are placed 

 and bolted together. Two boards, like that shown at G, are 

 placed between the planks at the ends, to form the ends of 

 the mould ; these boards are placed between the two bolts 



a a, 



