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Science Museum Group
© The Board of Trustees of the Science Museum
Six Barton's buttons, (speculum metal ruled with a diffraction grating pattern), made by John Barton, London, c. 1830, in red leather box, marked No 11, lined with velvet and silk. diameter of buttons, minimum to maximum size is 20-23 mm
Details
- Category:
- Optics
- Object Number:
- 1926-31
- Materials:
- bronze alloy with arsenic (copper, tin alloy), metal, brass (copper, zinc alloy), wood, leather, textile, velvet, silk and paper
- Measurements:
-
overall: 22 mm x 95 mm x 61 mm, , .06kg
- credit:
- Barton, R.
