Fig 1: Begun in 1927 by Professor Thomas Parnell, this experiment was
meant to reveal the surprising properties of an everyday material: pitch. Pitch
is the name of a number of hard tar-like substances and in this case bitumen
was used. Though at room temperature pitch appears to be a solid and can be
shattered by a hammer, it is in fact a very high-viscosity liquid, and
Professor Parnell wanted to prove it.
(University of Queensland Brisbane, Australia, ref: