Rotating Multiplication Table
notes: label: Description
content: This device is a rotating multiplication table. It consists of a wooden box containing a cylinder of sheet steel, which is rotated by turning a metal knob on the left side. A lid at the front of the box opens to reveal rows of numbers on a paper table pasted to the cylinder, and a paper strip with three horizontal rows of numbers pasted to the box in front of the cylinder. The numbers are handwritten in pen.
label: Description
content: The leftmost numbers on the cylinder, indicated in red, increase from 1 to 75 as a knob on the side is rotated. The numbers in the top row, also indicated in red, increase from .05 5/11 to .35. From .05 5/11 through .10, these numbers increase by about .018 from one column to the next (each number at the head of a column is .01 9/11 larger than the previous one. Thus the second column has the heading .07 3/11), and from .10 through .35 they increase by .0125. The three rows of numbers on the sheet attached to the box are labeled 1/1, 1/2, and 1/4. Entries in the table are in black ink, and represent the product of the number in the uppermost row by that in the leftmost column, rounded off to the nearest hundredth (e.g., to cents). What the numbers in the table signify is unclear.
label: Description
content: The instrument was collected in 1966 from Howard S. Pellatt, President of Dudley Shuttles. Dudley Shuttles was the descendent of a firm founded in 1825 in Wilkinsonville, Massachusetts, that made wooden shuttles for textile mills.
label: Description
content: Compare 389100.
label: Location
content: Currently not on view
topic: label: Subject
content: Mathematics
setName: label: See more items in
content: Medicine and Science: Mathematics
label: See more items in
content: Mathematical Charts and Tables
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content: Science & Mathematics
creditLine: label: Credit Line
content: Gift of. Howard S. Pellatt
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: MA.328416
label: accession number
content: 272524
label: catalog number
content: 328416
objectType: label: Object Name
content: mathematical table
physicalDescription: label: Physical Description
content: wood (overall material)
label: Physical Description
content: paper (overall material)
label: Physical Description
content: metal (overall material)
label: Measurements
content: overall: 14.5 cm x 37 cm x 14.5 cm; 5 23/32 in x 14 9/16 in x 5 23/32 in