Six Barton's buttons, (speculum metal ruled with a

Made:
1825-1835 in London
maker:
John Barton

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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:
brass (copper, zinc alloy), bronze alloy with arsenic (copper, tin alloy), leather, metal, paper, silk, textile, velvet, wood
type:
diffraction grating - reflection
taxonomy:
  • furnishing and equipment
  • tools & equipment
  • optical instrument
  • optical instrument component
  • diffraction grating
credit:
Barton, R.

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