DE MURALT SYSTEM
129
these pins got broken off, either by accident or intent, and the modern practice is to work a hole in the clay with bars and ram the cavity so formed full of concrete. This forms an irregularshaped attachment between the tile and the clay bed. The advantages of this system are its cheapness and the fact that
M               W               *1---\ fz---> 0           
                                :oi                       
                                >---k                     
       T"1'             i-°4           H        h         
       i ;                                                
!o!             ----y           U             H           
>---j-          : 0 !                                     
                >---1                                     
       'o'              T01            i?4      iol )     
                        >----1,                   <       
">---< c------J ‘j----<         0      V /    n     s---  
                L°-i                                ! O   
                                                    i*--- 
PLAN.
Fig. 3a.—De Muralt Concrete Plating of Embankment* (Light Type)
it is elastic. Slight movements in the bank do not affect it, owing to its lack of rigidity. The cost under normal conditions, including the dressing of the bank to receive the slabs, is about 7s. to 7s. 6d. a square yard. The cost of stone and chalk having materially increased, this type of the de Muralt system is probably somewhat cheaper than current English standard methods. It is available only in positions of lesser exposure, and the slabbing has to be periodically overhauled, as vegetation is apt
(0 924)	10