X-Ray Analysis of the Gingin Upper Greensand. 
231 
Figure 2. 
Sketch of the landslide at Poison Hill, Gingin, from which the three samples representing 
(1) soil, (2) subsoil, and (3) upper greensand were taken in the same profile Sample (1) 
was collected on the surface a little back from the edge of the landslip. The greensand 
carries vertical joints along which there is secondary deposit and at its base there is a 
line of ferruginous nodules (about four feet from the top of the greensand bed). The 
lower portion of the subsoil horizon, close to the greensand contact, contains much weathered 
greensand. 
E 
Figure 3. 
Diagrammatic arrangement of the high tension unit. X-ray tube (X). Condenser (C) 
High Tension . Valve (V), High Tension Transformer (T), Earth (E). 
