Abstract: A support device for eyeglass frames whereby the contour of one or both rims or surrounds of the frame can be read comprises a plurality of retaining means on a plate and on a flap pivoted to the plate. The retaining means are adapted to hold an eyeglass frame above a hole in the plate. The flap is pivoted to the plate and its inclination relative to the plate is adjustable.

Abstract: A device for examining under conditions of lighting on a black background an object such as the surface of a spectacle lens, comprising, in a casing, a support for supporting the object to be examined, and black background lighting means including an opaque screen adapted to arrest the light rays issuing from a light source and able of penetrating directly an aperture provided in said support, as well as reflecting and/or concentrating means adapted to reflect laterally the light beams issuing from said light source, which are transmitted to said object through said aperture, said light source being disposed in a fixed position determined with reference to the periphery of said opaque screen, wherein said casing comprises a mounting opening which opens into an opening of said reflecting means and allows said light source supported by said screen on the side opposite to the aperture of the support to be easily mounted in position.

Abstract: A ceiling construction for demonstration equipment comprises a number of rectangular panels which between them define guide slots for a sliding link chain which will carry samples. The panels are supported by parallel rails which carry undercut longitudinal grooves on their lower sides for the receipt of clamping elements carried on the upper surfaces of the panels, the disposition of the grooves and clamping elements being such as to maintain a desired width along the length of the slots. Adjacent panels may be spaced as required in the longitudinal direction of the grooves by longitudinally positioned spacing pieces positioned in the grooves.