Abstract: A method and apparatus are provided for testing containers such as glass bottles. The container is filled with an opaque material and then immersed in a bath having two parallel walls of light transmitting material. The bath contains a light transmitting liquid having a refractive index comparable with that of the material of the container and a light transmitting efficiency different from that of the material of the container. Light is projected through the parallel walls of the bath to illuminate the walls of the container so that the wall thickness is clearly visible and the distribution of wall thickness can be studied.

Abstract: An article carrier having two opposed open sides. The carrier comprises a bottom and a top wall spaced apart in substantially parallel relationship by two transverse walls extending between opposed end edges of the bottom and top wall. An article retaining panel extends from a respective side edge of both the bottom and top wall and inclined inwardly between the bottom and top wall. Article retaining cavities are formed in each of the article retaining panels and defined retention ribs therebetween. The cavities in the panels are in transverse alignment with cavities in an opposite retaining panel whereby an article may be removably secured between vertically aligned pairs of cavities by frictional engagement by the ribs and by a pressure applying panel applying inward pressure between the ends of the article.