Bar Breaking Apparatus Comprising a heavy cast iron frame 340 x 120 x 100 mm with slotted end pillars to carry a stout iron bar.To show the forces which can be exerted during thermal expansion or contraction. Comprising a heavy. cast iron frame 340 x 120 x 100 mm with slotted end pillars to carry a stout iron bar. The bar is threaded at one end for a large tensioning nut and has holes at the other end to accommodate the cast iron breaking bars. Supplied complete with ten breaking bars