Case for 6-inch circular protractor
Mahogany case for 6- inch circular protractor by John Troughton, c.1785
- Materials:
- mahogany
- Object Number:
- 1918-122 Pt1
- type:
- instrument case
- Image ©
- The Board of Trustees of the Science Museum
Circular protractor, 1765-1770
- maker:
- John Troughton
Six inch circular protractor by John Troughton, in mahogany case, c.1785
Details
- Category:
- Mathematics
- Object Number:
- 1918-122
- Materials:
- brass (copper, zinc alloy), mahogany (wood) and complete
- type:
- drawing instrument and circular protractor
- credit:
- Thomas H. Court
Parts
John Troughton's six inch circular protractor
Six inch circular protractor by John Troughton, c.1785
- Measurements:
-
overall: 3 mm x 193 mm x 155 mm,
- Materials:
- brass (copper, zinc alloy) and glass
- Object Number:
- 1918-122 Pt2
- type:
- drawing instruments and circular protractors
- Image ©
- The Board of Trustees of the Science Museum
