Automatic sun valve used for gas lighting, Aug 1964
Reference Number: PAColl-8557-02
Photograph of an automatic sun valve, a device used to turn the beacon of automatic gas-lights (such as lighthouse lights) on and off. Originally published with the caption: `The device used to operate all automatic gas lights in this country. Sunlight is absorbed by a copper tube coated with lamb-black in the centre, and is converted into heat. The heat causes the tube to expand, thus closing off the gas supply and extinguishing the light. When night falls, the tube contracts and opens the gas valve, turning on the light.' (Evening Post, 27 August 1964).Photograph taken in August 1964 by an unidentified photographer for the Evening Post.
Evening Post photographic prints, Reference Number PAColl-0614-2 (404 digitised items)
Evening Post :Photographic negatives and prints of the Evening Post newspaper, Reference Number PA-Group-00287 (5802 digitised items)
Extent: 1 b&w original photographic print(s)Silver gelatin print 11.4 x 5 cm (irregular). Vertical imageSingle photograph
Conditions governing access to original: Not restricted
Inscriptions: Inscribed - Verso - centre: Date stamp: 27 Aug 1964; Verso - centre: Evening Post stamp: Evening Post / Wellington, N.Z. / Aug 1964 / Copyright photo
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