Oscillogram showing alpha approximately equal to 140 degrees
name: label: Collection Creator
content: Du Mont, Allen B. (Allen Balcom), 1901-1965
setName: label: See more items in
content: Allen Balcom Du Mont Collection
label: See more items in
content: Allen Balcom Du Mont Collection / Series 17: Addenda / Lantern Slides
container: label: Container
content: Box 65, Item 138-93
dataSource: label: Archival Repository
content: Archives Center, National Museum of American History
objectType: label: Type
content: Archival materials
label: Type
content: Slides