Demainbray's optical model

Made:
1752
Optical model of a spectrum with inverted colours. Science and Splendour: Treasures from the court of King George III. Touring Exhibition. Optical model of a spectrum with inverted colours.  Science and Splendour: Treasures from the court of King George III. Touring Exhibition. Optical model of a spectrum brought to a focus, 1753. Dr. Stephen Demainbray (1710-1782), a lecturer on experimental philosophy, devised these 'optical machines' as poor weather often prevented experiments on sunlight. They represented experiments on the spectrum of sunlight using prisms. Optical model of a spectrum with inverted colours Optical model of a spectrum with inverted colours

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Optical model of a spectrum with inverted colours. Science and Splendour: Treasures from the court of King George III. Touring Exhibition.
King's College, London| Enquiries to Science Museum, London
Science Museum Group Collection

Optical model of a spectrum with inverted colours. Science and Splendour: Treasures from the court of King George III. Touring Exhibition.
King's College, London| Enquiries to Science Museum, London
Science Museum Group Collection

Optical model of a spectrum brought to a focus, 1753. Dr. Stephen Demainbray (1710-1782), a lecturer on experimental philosophy, devised these 'optical machines' as poor weather often prevented experiments on sunlight. They represented experiments on the spectrum of sunlight using prisms.
King's College, London| Enquiries to Science Museum, London
Science Museum Group Collection

Optical model of a spectrum with inverted colours
Science Museum Group
© The Board of Trustees of the Science Museum, London

Optical model of a spectrum with inverted colours
Science Museum Group
© The Board of Trustees of the Science Museum, London

Optical model of a spectrum with inverted colours, maker unknwon, 1752. Once belonged to Stephen Demainbray. A handwritten inscription on the base reads: 'Prism screen & convex lens/Colours inverted '4''.

This model is one of a series of optical models that were once owned by Stephen Demainbray and used by him in his lectures on natural philosophy. it is the most complex of the series and consists of a pinhole in wood with a prism, a convex lens, a second pinhole at the focus of the lens, and a screen. Originally silk cords would have been used to represent the rays of light. Demainbray worked as superintendent at the King's observatory at Kew from 1768 and his collection of instruments and apparatus was absorbed into the King's own collection.

Details

Category:
King George III
Object Number:
1927-1432
Materials:
fruitwood, incomplete, ivory, mahogany and paper (fibre product)
type:
optical demonstration equipment
taxonomy:
  • visual and verbal communication
  • furnishing and equipment
  • tools & equipment
credit:
King's College, London