This photomultiplier tube was used with photoelectric photometers at the Lick Observatory. It is a Lallemand standard 12-stage red-infrared sensitive unit with an electronic lens (a Lallemand invention) for restricting the size of the effective photocathode thereby much reducing the background current from the red sensitive cathodes. In publications, it was designated “Lal III.” André Lallemand (1904-1978) was a French astronomer, and director of the Institut d’Astrophysique de Paris.
Our collection database is a work in progress. We may update this record based on further research and review. Learn more about our approach to sharing our collection online.
If you would like to know how you can use content on this page, see the Smithsonian's Terms of Use. If you need to request an image for publication or other use, please visit Rights and Reproductions.