Tyndall's bar breaker

1) Setup experiment with connecting rod (b) placed in frame (d) held by bar (c) and fastened by nut (a). 2) Heating phase with compensation of length extension by fastening nut (a). 3) Cooling phase with deformation or breaking of bar (c).
Realisation of Tyndall's bar breaker experiment ready to start.

Tyndall's bar breaker is a physical demonstration experiment to demonstrate the forces created by thermal expansion and shrinkage. It was demonstrated 1867 by the Irish scientist John Tyndall in his Christmas lectures for a "juvenile auditory".[1][2]

  1. ^ John Tyndall (1867), Chaleur et Froid: Six leçons faites devant un jeune auditoire pendant les vacances de noel 1867 (in French), translated by Abbé Moigno, Paris, p. 28, retrieved 2020-09-08{{citation}}: CS1 maint: location missing publisher (link)
  2. ^ "On Heat and Cold: A Course of Six Lectures (Adapted to a Juvenile Auditory) (Christmas 1867)", The Chemical News, vol. XVII, no. 423, p. 15, 1868, retrieved 2020-09-08