- Subject
- Calculation
- Item type
- Object
- Makers
- William Deane
- Primary inscriptions
- "W. Deane Fecit"
- Physical material
- Brass
- Object type
- Sector
- Dimensions
- Height: 123mm Width: 34mm Depth: 2mm
- Inventory No
- 40469
Description
Brass 4.5" sector. The signature side carries sectoral scales of sines (S) and tangents (T and t) and a double line of numbers. The reverse has lines (L), chords (C) and secants (s), along with single scales of tangents (Tan) and sinces (Sin). There is an inch scale along the outer edge.
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