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
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, Kenneth E. Behring Center

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