Wilson expansion apparatus

Cloud chamber photographic negatives, 1922

Photogaphic print and diagram, showing showing secondary beta-rays ejected from air and from a copper screen by X-rays

Black and white photographic print, stereoscopic pair of cloud-track photographs showing tracks of electrons

Photogaphic print, showing a secondary beta-ray ejected from platinum by X-rays, together with a secondary beta-ray due to platinum K-radiation

Photographic print, showing the formation of a new isotope of helium by bombarding heavy hydrogen with deuterons

Photogaphic print and diagram, showing secondary beta-ray ejected from copper by X-rays together with a secondary beta-ray due to copper K-radiation

Early stereoscopic pair of cloud-track photographs, (1913-1914), illustrating electrons ejected by a narrow beam of X-rays

Stereoscopic pair of cloud-track photographs showing the passage of an X-ray beam through a copper target

Photographic prints, of early stereoscopic pair of cloud-track photographs, (1913-1914), illustrating a fan of alpha-rays

Black and white photographic print, showing secondary electrons produced in air by gamma-rays

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