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.
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