Trigonometric Calculating Instrument

Trigonometric Calculating Instrument

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Description
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.
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.
Location
Currently not on view
Object Name
Trigonometer
calculating instrument, trigonometric
mathematical table
trigonometer
date made
1919
1919-02-15
associated dates
1919 02 15 / 1919 02 15
unspecified
Wheeler, Albert Harry
maker
Wheeler, Albert Harry
place made
United States: Massachusetts, Worcester
associated place
United States: Massachusetts, Worcester
Physical Description
paper (overall material)
tan (overall color)
black (overall color)
cut from paper (overall production method/technique)
Measurements
average spatial: 21 cm x 17.5 cm x .5 cm; 8 9/32 in x 6 7/8 in x 3/16 in
ID Number
1979.3002.113
catalog number
1979.3002.113
nonaccession number
1979.3002
Credit Line
Gift of Louise D. Campbell
subject
Mathematics
See more items in
Medicine and Science: Mathematics
Science & Mathematics
Trigonometry
Data Source
National Museum of American History

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