Calculation of Temperature Distributions in Glass Plates Undergoing Heat‐Treatment

A method is presented for calculating temperature distributions in diathermanous sheets that are being heated or cooled. It differs from previous calculations of this type in that it takes a more comprehensive account of radiative effects that play a part in these processes. Principally, these effects are the penetration of external radiation into the sheet, the emission and partial re-absorption of radiation within the sheet, and multiple internal reflection between the surfaces of the sheet. A high-speed digital computer has been programmed to perform these calculations. The results of a few representative examples are presented to illustrate the influence of diathermancy on the thermal history of glass plates undergoing various heat-treatments.