Fall of a feather.
M/S of recording equipment, a man walks up and adjusts the giant amplifier. C/U's of various parts of the machine including milliamperes dial. M/S of engineers listening in to amplifier and tuning into cathode-ray tube in oscilloscope. They demonstrate by...
Experiments using electricity to shatter different kinds of materials.
A large power press crushes a tree trunk, a watch face and a riveted joint.
Footage of Scientist experimenting with coal dust in laboratories.
Machines which make "man-made lightning" are demonstrated.
Harmonograph recording two or more connected movements is presented at G.W.R Show.
Proposals for construction 'perpetual motion' machines - none of them works.
Road safety campaign for children in London.
Ghostly white shapes emerge against a black background - no soundtrack.