Item 275

Price Realized:  $130
Miscellaneous: Seger Pyrometric Cones
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Item: 275  Description: Miscellaneous: Seger Pyrometric Cones. These were used in the early days of porcelain manufacturing to ensure that the firing temperature of the kiln was sufficient to thoroughly vitrify the insulators. In 1886, Dr. Herman Seger invented this simply method. Each spike (called a cone) melted at a specific temperature. See the illustration in View 2 from Elton Gish’s Unipart book where the process is explained on pages 26 & 27. The cones rest in a base called a plaque. View 3 shows the second part of this lot, which appears to be rests for use in firing an insulator. One is one-and-three-quarters inches between two points; the other one-and-a-third.
Estimate: $50 - $75  Open: $25
Price Realized:  $130