Calibration of Pyrometric Cones

Abstract

Pyrometric cones produced by the Standard Pyrometric Cone Company (now known as The Edward Orton, Jr., Ceramic Foundation) were calibrated at the National Bureau of Standards in 1926. Cones available from the 1926 calibration were recalibrated, and new working standards were obtained by calibrating specimens of present production from the Orton Foundation. Heating rates of 150° and 60°C. per hour were used in determining the end points of a series of large cones, whereas a rate of 300°C. per hour was employed for the small cones through cone 12. The pyrometric cone equivalent (P.C.E.) series was calibrated and extended down to cone 12.