Demainbray's optical model

Made:
1752
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.

Buy this image as a print 

Buy

License this image for commercial use at Science and Society Picture Library

License

Buy this image as a print 

Buy

License this image for commercial use at Science and Society Picture Library

License

Buy this image as a print 

Buy

License this image for commercial use at Science and Society Picture Library

License

Buy this image as a print 

Buy

License this image for commercial use at Science and Society Picture Library

License

Buy this image as a print 

Buy

License this image for commercial use at Science and Society Picture Library

License

Buy this image as a print 

Buy

License this image for commercial use at Science and Society Picture Library

License

Buy this image as a print 

Buy

License this image for commercial use at Science and Society Picture Library

License

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

King's College, London| Enquiries to Science Museum, London
Science Museum Group Collection

King's College, London| Enquiries to Science Museum, London
Science Museum Group Collection

King's College, London| Enquiries to Science Museum, London
Science Museum Group Collection

Science Museum Group
© The Board of Trustees of the Science Museum, London

Science Museum Group
© The Board of Trustees of the Science Museum, London

Science Museum Group
© The Board of Trustees of the Science Museum, London

Optical model showing the direction of rays through a prism, maker unknwon, 1752. Once belonged to Stephen Demainbray. A handwritten inscription on the base reads: 'Prism, 2 Screens and Convex Lens/ from single ray'..

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 shows light rays passing through a prism to form a spectrum on the first screen. If separate colours are allowed to pass through this screen, they are brought to focus on the second screen by the convex lens. 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:
1927-1436
Materials:
fruitwood, incomplete, ivory, mahogany (wood) and paper (fibre product)
type:
optical demonstration equipment
taxonomy:
  • visual and verbal communication
  • furnishing and equipment
  • tools & equipment
credit:
King's College, London