![Postcard of Plotting protractor.](/database/media.php?file=postcard/image/0098/00987240.jpg&PHPSESSID=2n4f50kvme1pn1l702jeqvb944) 000-100-102-714-C © National Museums Scotland |
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Plotting protractor
This brass plotting protractor was made around 1870 by Angus Henderson, a scientific instrument maker based in Edinburgh. It is used to divide the circle into sections.
The protractor has 400 'grades' or metric degrees, instead of being divided into 360 degrees. This aspect of metrification never became popular.
Angus Henderson began trading independently as a 'Practical Optician, Microscope, Mathematical and Philosophical Instrument maker' in Edinburgh's Hanover Street in 1861. He ceased to trade in 1884.
Record details
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Online ID: |
000-100-102-714-C |
Image Rights Holder: |
National Museums Scotland |
Project: |
0098: National Museums Scotland
Project description | View all records in project |
Ref: |
National Museums Scotland T.1967.122 |
Date: |
Around 1870 c. 1870
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Material: |
Brass scale and verniers, index marked on glass / wooden box. Inscription: A. Henderson Edinburgh / Wm Paton / Alloa
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Dimensions: |
1.75" H x 9.25" L x 9.50" W; 7.75" D
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What: |
Protractor, plotting / box
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Subject: |
19. MATHEMATICS (Departmental Classification)
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Who: |
A. Henderson, Edinburgh (Maker) William Paton (Inscribed on the protractor spokes)
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Where: |
Scotland, Clackmannanshire, Alloa Scotland, Midlothian, Edinburgh
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Event: |
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Description: |
Eight-inch plotting protractor, in a box, signed by Angus Henderson of Edinburgh, c. 1870
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References: |
- Clarke, T.N., Morrison-Low, A.D. & Simpson, A.D.C. Brass & glass scientific instrument making workshops in Scotland as illustrated by instruments from the Arthur Frank Collection at the Royal Museum of Scotland. Edinburgh: NMS, 1989. pp 51,64
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