Improvements in Prytherch's capacity dilatometer

Circular of the Bureau of Standards no. 486:

“…Ifaughton and Adcock [27] alteri'd this apparatus somewhat to ('xamine sam-])les at tempcratui'es up to 1,:')()()°C in an iiu'rt: atmos])h<'r('.…”

“…Eq 25 can be transformed into the following form' Z, = io[l + (4.73t + 0.00226t-)10-®], (27) where Lt is the length of the sample at any temperature t, between -142.5°and +305°C, and Zo the length at 0°C . In this equation, 4.73X represents the instantaneous coefficient of expansion at 0°C .…”