“…Theoretically curious results were obtained when solutions were allowed to flow into other solutions of the same refractive index but different chemical composition. Finally the Schlieren technique was used in the observation of the changes at the critical temperature (39). A simple experimental arrangement was developed, and the usefulness of the determination of the critical temperature for the identification of small quantities of material was demonstrated.…”
“…Theoretically curious results were obtained when solutions were allowed to flow into other solutions of the same refractive index but different chemical composition. Finally the Schlieren technique was used in the observation of the changes at the critical temperature (39). A simple experimental arrangement was developed, and the usefulness of the determination of the critical temperature for the identification of small quantities of material was demonstrated.…”
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