FOR THE RECORD - Jan. 25, 2009

3-D glasses: In Thursday’s Calendar, an article about new 3-D technology referred to the cheap cardboard red-and-blue 3-D glasses as the stuff of ‘50s nostalgia. Actually, the 3-D movie craze of the years 1952-1955 mostly used polarizing projection and polarized glasses so that each eye saw a separate filtered image, producing a three-dimensional effect. The cheaper color-filtered method was less common then.