U.S. Philips Corporation

Optical Storage International Holland

Leonardus P Hoogeveen

Sybrandus Van Heusden

Hendrikus W Peeters

Aloysius M Spruijt

An interchangeable optically readable storage disk has a substrate with a recording surface, and a cover thereon which may comprise a second substrate with a further recording layer. The disk includes a protecting arrangement at the circumference of the substrate, which includes a balancing arrangement. The balancing may be effected by apertures in the protecting arrangement, or balancing masses affixed thereto.

Optically readable storage disc

Device for determining the concentration of vaporous components in a gas current, wherein the gas current reacts in a heated reaction room with ozon and the intensity of the chemiluminescent radiation emitted herewith is measured by a photoelectric cell.

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Eindhoven, Netherlands

Leonardus P Hoogeveen