Photo-Multiplier Tube
notes: label: Description
content: 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.
label: Location
content: Currently not on view
setName: label: See more items in
content: Medicine and Science: Physical Sciences
creditLine: label: Credit Line
content: Gerald Kron
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 1997.0340.04
label: catalog number
content: 1997.0340.04
label: accession number
content: 1997.0340
objectType: label: Object Name
content: Tube, Photo-Multiplier, Lallemand
physicalDescription: label: Measurements
content: overall: 4 cm x 4.8 cm x 20 cm; 1 9/16 in x 1 7/8 in x 7 7/8 in
label: Measurements
content: overall: 7 5/8 in x 1 1/2 in; 19.3675 cm x 3.81 cm