A.S. Campbell Company, correspondence, notes and calculations
name: label: Collection Creator
content: Halkett, James Nicol, 1895-1953
setName: label: See more items in
content: James Nicol Halkett Papers
label: See more items in
content: James Nicol Halkett Papers / Series 2: Companies / 2.4: A.S. Campbell Company
unitdate: label: Date
content: 1942-1943
container: label: Container
content: Box 1, Folder 10
dataSource: label: Archival Repository
content: Archives Center, National Museum of American History
objectType: label: Type
content: Archival materials
scopecontent: label: Scope and Contents
content: Includes a drawing for variation in hardness, Rockwell 30-T scale on 20 mm steel cartridge cases with increase in temperatures, 1943.