The Brush Surface Analyzer is designed for rapidly analyzing and directly recording the irregularities of finished surfaces of metals, glass, paper, plated and painted surfaces and the like. It consists of three principal units an analyzing head, a calibrating amplifier and a direct inking oscillograph. These three units give an instantaneous and permanent record of a finished surface, the irregularities of which may be magnified as desired up to 100,000 times.
Aircraft Engineering and Aerospace Technology – Emerald Publishing
Published: May 1, 1941