388 



PROFESSOR CHRYSTAL AND MR JAMES MURRAY 



A horizontal triangular frame was first laid down over the well as a foundation. 

 The apex of the triangle projected a few feet into the loch, and the shoreward base 

 was weighted with heavy stones. Three vertical posts were then fixed to this founda- 

 tion, to carry the platform. The upright at the apex of the triangle is the most 

 important, as it goes into the loch and steadies the whole erection. It is therefore 

 pointed, and driven a short distance into the gravel, being prevented by a cross-piece 

 from sinking deeper during the movements of the gravel in stormy weather. The 



Fig. 20.- — The Sarasin Limnograph at East Binode, near Ardtrostan House, 

 showing staging and shelter-hut over limnograph. 



triangular platform was built about 6 feet above the normal low level of the loch, to 

 allow for the rise that occurs in ordinary spates. 



The whole frame was securely stayed in all directions. The cylinder fitted into 

 the apices of the two horizontal triangles, and was kept in place by cross-pieces : it 

 was found necessary to have several of these in the length of the cylinder, to prevent 

 its destruction during storms. The box containing the recording part of the apparatus 

 was placed on the platform, and a rough little hut built over it, to allow of access 

 during rain. 



