Oil-filled ceiling rose
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This image is released under a CC BY-NC-SA 4.0
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Science Museum Group
© The Board of Trustees of the Science Musuem
SMG00223948
Science Museum Group
© The Board of Trustees of the Science Museum
Oil-filled ceiling rose, incorporating "St. Helen's Corrosion-proof system" White's pat. No.22198/13; used in situations such as chemical works where sparks could cause fire
