The Softening Point of Glass

JSGT_1940_V24_T176_T185

The author discusses the two generally accepted definitions of softening point based, respectively, on the fibre extension method and on the thermal expansion method; describes the fibre method used for many years by himself; gives comparative results for four glasses by the two methods and recommends the fibre extension method on the grounds of speed, accuracy and the possibility by it of referring the softening point to a definite viscosity value.

Dr J. T. Littleton