Description

Edward B. Feinberg works with a height sensing device in a laboratory. Technology Review, March 1962, p. 22.

Original Caption: "optics".

Original Caption: "Edward B. Feinberg, '62, of Belmar, N.J., devised a height-sensing unit. A liquid column in a glass tube is still the simplest, most reliable way to measure, say, the pressure of the atmosphere. Feinberg built a refinement for a mercury barometer to give a varying signal as the column rose or fell. In his apparatus, a light beam passes through the glass tube and after being split by a mirror falls on two photoconductive cells connected in a bridge circuit. As the mercury surface moves, the light on one cell increases and that on the other decreases. Feinberg is shown at the left aligning his optical system."