Earthquake damage, San Fernando Valley, 1971

Object configuration showing oval/elliptical shape with directional arrow marked 100 YA

Diagram of vessel or object with compartments and hawser attachment

White line drawing or sketch on grainy/textured background showing what appears to be a ladder-like or tower structure with geometric patterns

Figure 1 showing variables R, L, H, θ, φ.

Richard S. Leghorn

RAF Canberra Mark-PR3

Kelly Johnson

Trevor Gardner