A tilfing platen (fig, 8) is also being tested for determining angles of slopes 
in stereoscopic models of the multiplex type. The platen is raised or lowered to an 
appropriate level in the stereoscopic model and is then tilted to coincide with the 
slope desired. This is a true angle of slope that can be read on a clinometer. 
== The tilting platen used in determining angles of slope In 
multiplex~type stereoscopic models.