Object Details
- Wheeler, Albert Harry
- 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
- Credit Line
- Gift of Louise D. Campbell
- 1919
- 1919-02-15
- ID Number
- 1979.3002.113
- catalog number
- 1979.3002.113
- nonaccession number
- 1979.3002
- Object Name
- Trigonometer
- calculating instrument, trigonometric
- mathematical table
- trigonometer
- 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
- place made
- United States: Massachusetts, Worcester
- associated place
- United States: Massachusetts, Worcester
- See more items in
- Medicine and Science: Mathematics
- Trigonometry
- Science & Mathematics
- National Museum of American History
- Subject
- Mathematics
- Record ID
- nmah_1156996
- GUID (Link to Original Record)
- https://n2t.net/ark:/65665/ng49ca746a9-f951-704b-e053-15f76fa0b4fa
