1968 Press Photo Tiny Versatile Thermometer Shown By Praying Mantis For Size

Most Versatile Thermometer - The tiny temperature sensor in the center of this picture can operate over an unprecedented range, extending from minus 325 degrees F (at which many gases liquefy) to plus 1200 degrees F "at which metals glow red hot). he heart of the sensor, dwarfed by a praying mantis, is a tiny man-made diamond, which is encased within the glass bead. As the temperature rises or falls, the diamond's electrical resistance decreases or increases in measured amounts.

Photo is dated 1968.

Photo measures 8 x 10.25 inches.