Demainbray's wharf jib crane model

Model of a wharf jib crane, maker unknown, England, 1729-1753 Model of a wharf jib crane, maker unknown, England, 1729-1753 Model of a wharf jib crane, maker unknown, England, 1729-1753

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Creative Commons LicenseThis image is released under a CC BY-NC-SA 4.0 Licence

Buy this image as a print 

Buy

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

License

Creative Commons LicenseThis image is released under a CC BY-NC-SA 4.0 Licence

Buy this image as a print 

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

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Model of a wharf jib crane, maker unknown, England, 1729-1753
Science Museum Group Collections
© The Board of Trustees of the Science Museum, London

Model of a wharf jib crane, maker unknown, England, 1729-1753
Science Museum Group Collections
© The Board of Trustees of the Science Museum, London

Model of a wharf jib crane, maker unknown, England, 1729-1753
Science Museum Group Collections
© The Board of Trustees of the Science Museum, London

Model of a wharf jib crane, maker unknown, England, 1729-1753. Once belonged to Stephen Demainbray.

The original crane was designed for Mr. Ralph Allen, a quarry owner at Bath, Avon. The rope passes over a vertical pulley and between two horizontal pulleys, the small roof keeps it dry. The gearing enables a large weight to be lifted using little effort and the horizontal pulley allows the arm to be turned easily. This model was used by Stephen Demainbary in his lectures on natural philosophy. 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:
1927-1928
Materials:
mahogany, ivory, iron, lead, paper and hemp
Measurements:
overall: 195 mm x 355 mm x 190 mm, 0.5 kg
type:
model - representation
credit:
King's College, London