Museo de Física, FCEyN, UBA

Proyecto Museo del Departamento de Física, FCEyN, UBA

Pieza # 087

Información Disponible # 87 Denominación identificatoria Fosforoscopio de Bequerel Función Demostración Principio de funcionamiento Fenómeno de `after-glow` Referencias locales
Marcas
Época 1857 Referencias bibliográficas
Referencias en Internet http://www.abdn.ac.uk/~nph126/selected.php?id=31
Referencias personales
Comentarios Looking like some mechanical toy, this device needs no instruction to tell you to turn the handle and keek through the window at the top. As your expectations rise with the pitch of the clattering gearwheels and you peer harder, a cloud of disappointment will surely eclipse your efforts. Nothing at all can be seen in the window. The Becquerel phosphoroscope is not a toy but a remarkable piece of equipment devised in 1857 to investigate the phenomenon of after-glow. When set up correctly it is able to achieve by mechanical means what today would require a bench of optical and electronic equipment, and a handsome supportive grant. Phosphorescence is the ability of a material to give out light of one colour significantly after it has been illuminated by light of a more energetic colour. It is the basis of many glow-in-the-dark dyes. A related phenomenon was at the heart of the first modern laser, though of course Becquerel did not forsee this development. Our own phosphoroscope is built to the pattern of the French model (made by the notable Paris instrument maker Duboscq) but bears the stamp of Alex Spark, a local instrument manufacturer whose premises were well-known in Aberdeen 100 years ago.

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