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Expired
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Martha Helliwell
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Individual
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Individual
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Publication of GB190315117ApublicationCriticalpatent/GB190315117A/en
15,117. Helliwell, M. July 8. Chimney and ventilating-shaft tops.-A wind directed cowl, constructed to prevent downdraughts, of which Fig. 1 represents an elevation with one side removed, is supported by means of the bridge-piece 11, upon the spindle 5, above the conical outlet of the chimney. Its sides extend below the top of the outlet, and the inclined top extends beyond the rear plate 6B. Attached to the cowl is a vane 8 balanced by an extensionbar. Sudden gusts of wind blowing into the cowl escape through the space 7 round the conical top, and also through holes 10 formed in the rear plate 6B. The cowl is of triangular shape in one direction and square or of other convenient shape in the other direction.
GB190315117D1903-07-081903-07-08Improvements in and relating to Cowls for Chimney and Ventilating Shafts.
ExpiredGB190315117A
(en)