Subatomic particle tracks. Coloured bubble chamber photograph showing tracks left by subatomic particles from a particle accelerator at CERN, the European particle physics laboratory at Geneva. A bubble chamber is a container filled with liquid hydrogen which is superheated - momentarily raised above its normal boiling point by a sudden drop in pressure in the container. Any charged particle passing through the liquid in this state leaves behind a trail of tiny bubbles as the liquid boils in its wake. The bubbles are seen as fine tracks, which show the characteristic paths of different types of particle and which are curved due to an intense applied magnetic field.
© PATRICE LOIEZ, CERN/SCIENCE PHOTO LIBRARY
The Bennie Railplane, 1930, (1933). Creator: Unknown
The Bennie Railplane, 1930, (1933). 'The George Bennie railplane is an astounding device by which existing railways could be speeded up for passenger traffic. Stream-lined cylindrical cars driven by air-screws fore and aft are suspended from a steel girder.' The Railplane was a high-level electrically powered suspended monorail system, brainchild of Scottish inventor George Bennie, and designed by engineer Hugh Fraser. A prototype was installed over an LNER siding to Burnbrae Dyeworks at Milngavie, near Glasgow, in 1930, however Bennie was never able to get sufficient financial backing to develop the idea further. From "The Pageant of the Century". [Odhams Press Ltd, 1933]
© The Print Collector/Heritage Images
Particle tracks in bubble chamber
Bubble chamber particle tracks. Colouredbubble chamber view of an electromagnetic shower(centre). This has been produced by a muon neutrino (entering from the left)interacting with a neutron at the border of thelarge circle. The tracks are caused by particlesmoving through superheated liquid, which will notboil until it is disturbed. The passage ofsub-atomic particles provides this disturbance, and they leave tracks of minute bubbles in theirwake. These tracks can be photographed andstudied. The "electromagnetic shower" occurs whenby-products of the interaction disturb thesurrounding liquid. Data from the Big EuropeanBubble Chamber (BEBC) at CERN.
© Cern/Science Photo Library