1851 Great Exhibition: Official Catalogue: Class X.: John Orchard
From Graces Guide
161. ORCHARD, JOHN, Kensington — Designer and Manufacturer.
Standard barometer, with various improvements. Series of rack slides for magic lanterns, to show the varied movements of the planets.
Air pump—having no valve to interfere between it and the receiver, so that the air can be exhausted from the receiver to such an extent as to freeze a vessel of water placed over sulphuric acid for desiccation.
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