Trigonometric Calculating Instrument
date: label: date made
content: 1919
label: date made
content: 1919-02-15
name: label: maker
content: Wheeler, Albert Harry
notes: label: Description
content: This square card has a rotating pointer attached at the center. A movable mechanism shows the length of the sine in various sectors of a circle.
label: Description
content: Marks indicate the sign of various other trigonometric functions. Thus the tangent, cotangent, and cosine are positive in the first quadrant; the cosine, cotangent, and tangent are negative in the second quadrant; the cosine is negative and the tangent and cotangent are positive in the third quadrant; and the cosine is positive, and the tangent and cotangent are negative in the fourth quadrant.
label: Location
content: Currently not on view
place: label: place made
content: United States: Massachusetts, Worcester
label: associated place
content: United States: Massachusetts, Worcester
topic: label: Subject
content: Mathematics
setName: label: See more items in
content: Medicine and Science: Mathematics
label: See more items in
content: Trigonometry
label: See more items in
content: Science & Mathematics
creditLine: label: Credit Line
content: Gift of Louise D. Campbell
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 1979.3002.113
label: catalog number
content: 1979.3002.113
label: nonaccession number
content: 1979.3002
objectType: label: Object Name
content: Trigonometer
label: Object Name
content: calculating instrument, trigonometric
label: Object Name
content: mathematical table
label: Object Name
content: trigonometer
physicalDescription: label: Physical Description
content: paper (overall material)
label: Physical Description
content: tan (overall color)
label: Physical Description
content: black (overall color)
label: Physical Description
content: cut from paper (overall production method/technique)
label: Measurements
content: average spatial: 21 cm x 17.5 cm x .5 cm; 8 9/32 in x 6 7/8 in x 3/16 in