The Problem of the Perverse Pinion
Exhibit A-4
Exhibit A-4

Defect (on drive side of tooth) extends accross root surface and up the back side of the tooth in the foreground. Two small chips were removed from the defect at the root surface. Magnetic particle inspection indicated sub-surface crackes along the pitch line and at the fillet at the tooth root. Note general roughness and "strings" of small defects along the the top of the surface of the tooth. (5x)