Title: Reversible thermometer

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Abstract: A thermometer including a heat sensitive material which undergoes a reversible visible change from a crystalline solid to a viscous mass at a predetermined temperature, said heat sensitive material comprising an individual or mixture of low molecular weight organic compounds and a polymer, said polymer being present in said mixture in an amount, effective to retard the crystallization of said organic compound between temperatures of from about room temperature to said predetermined temperature. Preferably a plurality of discreet heat sensitive materials each of which undergoes a visible change at a different predetermined temperature are supported on either a flat sheet or round cylinder which may be a dark transparent filter material. The heat sensitive materials are covered by a light transparent filter material which is preferably yellow. In the most preferred embodiment of the instant invention, said heat sensitive materials are contained in the compartments above perforations of a perforated sheet. Both the heat sensitive material and said perforated sheet may be the same color.


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