Felsenthal Graphical Site Table
date: label: date made
content: 1964
name: label: maker
content: Felsenthal Instrument Co.
notes: label: Description
content: This one-sided wooden instrument, similar to a slide rule, was designed in 1964 by Felsenthal Instrument Company but, according to the accession file, made at the Fort Sill Bookstore in Oklahoma. It was used to position a 155 mm howitzer armed with high-explosive M107 shells. The indicator is clear plastic with wooden edges held together with brass screws.
label: Description
content: The bottom of the base has a scale labeled Site and Vertical Interval. The lower right corner of the base is marked: Rule 2 (/) Apr 64. On one side, the slide has a scale for range and scales for the Target Above Gun (TAG) and Target Below Gun (TBG) with charges of 5 or 6. The other side of the slide has another scale for range and TAG/TBG scales for charges of 3, 4, and 7. Tables for the observer's position are on the left and right ends of the slide on both sides. Both sides are marked: HOW 155 mm (/) FT 155-AH-1 (/) PROJ, HE, M107 Rule 2 (/) Apr 64.
label: Description
content: Tables for angling guns to the left and right at various distances are printed under the slide. The back of the instrument has instructions and examples of use. The markings suggest that this rule was distributed in a white bag. Compare to 1977.1141.26, which may be an earlier version of the instrument.
label: Location
content: Currently not on view
place: label: place made
content: United States: Oklahoma, Fort Sill
topic: label: Subject
content: Mathematics
label: Subject
content: Rule, Calculating
label: Subject
content: Artillery
setName: label: See more items in
content: Medicine and Science: Mathematics
label: See more items in
content: Science & Mathematics
label: See more items in
content: Slide Rules
creditLine: label: Credit Line
content: Gift of Ben Wharton Rau and Margery Felsenthal Rau
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 1977.1141.27
label: catalog number
content: 336411
label: accession number
content: 1977.1141
objectType: label: Object Name
content: slide rule
physicalDescription: label: Physical Description
content: wood (overall material)
label: Physical Description
content: plastic (cursor material)
label: Physical Description
content: metal (part material)
label: Measurements
content: overall: 1.8 cm x 36.8 cm x 6.9 cm; 23/32 in x 14 1/2 in x 2 23/32 in