Abstract: Luminosity values of a structure carrying information, in particular grey scale values, are transformed into corresponding isochromates. The transformation is effected by optically imaging the information carrying structure onto a layer of liquid crystals. By this means, a thermogram corresponding to the information carrying structure produced in the layer of liquid crystals, so that the luminosity values of the structure carrying information is transformed into isotherms in the layer of liquid crystals, and the isotherms are converted into isochromates as a result of the colour/temperature behaviour of the layer of liquid crystals.

Abstract: A photographic apparatus for plate thermography comprising a support having a holder for a thermographic plate at one end and a photographic camera with flashlight at the opposite end. An adaptor designed to be mounted on the support and locked to it is provided for the attachment of different camera systems. Bus bars or contact rails are provided both on the support and in the adaptor so that when the adaptor is placed in position, electrical contact is established between the flashlight and a source of current on the support.