Crookes "Ray of Light" high-vacuum tube
notes: label: Description (Brief)
content: Crookes Ray of Light High Vacuum Tube, unmarked, 2 electrodes including a flat circular cathode at end opposite potash bulb extension. 6" long internal metallic plate coated with phosphorescence material. Cathode rays pass through thin slit in end of metal plate and trace out pathway along phosphorescent screen. If external magnetic field applied can visually see deflection of path of rays. If potash in end protrusion heated it releases a trace more gas decreasing the degree of exhaustion and the same magnetic field is observed to be more effective in deflecting path. Crookes interpreted this as resulting from the decrease of velocity of his molecular torrent due to increased resistance of medium allowing the magnetic field more time to act on individual molecules. Ref: Crookes "On Radiant Matter", pp. 19-20, fig. 15.
label: Location
content: Currently not on view
setName: label: See more items in
content: Work and Industry: Electricity
creditLine: label: Credit Line
content: from International Business Machines, Inc., William J. Hammer Collection
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: EM.320432
label: catalog number
content: 320432
label: accession number
content: 241402
objectType: label: Object Name
content: Discharge Tube
label: Object Name
content: crookes tube
label: Other Terms
content: Discharge Tube; Electron Tubes
physicalDescription: label: Measurements
content: overall: 12 1/2 in x 5 1/2 in x 2 in; 31.75 cm x 13.97 cm x 5.08 cm