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John Lever
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Individual
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Individual
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Publication of GB190506417ApublicationCriticalpatent/GB190506417A/en
6417. Lever, J. March 27. Chimney and ventilating - s h a f t tops.-An enlarged chamber G, open at K, is covered by a roof E, openings F being left as outlets for smoke &c. Other openings H are formed at a lower level in order that the wind may induce an up-draught.
GB190506417D1905-03-271905-03-27An Improved Roof Ventilator or Chimney Top.
ExpiredGB190506417A
(en)