1890 Patent No. 16,678 ventilation for sewer shafts, Wm Henry Mansbridge, Barnet

Patent No. 16,678 A.D.1890 Apparatus for Effecting the Ventilation of Sewer Shafts and Buildings also applicable for Increasing the Draught in Chimneys

"I, William Henry Mansbridge of No. 140 High Street Barnet in the County of Herts, Surveyor, do hereby declare the nature of this invention to be as follows: My invention has mainly for its object to produce an effective ventilation of snewer shafts and buildings by the action of the wind.  For this purpose I construct a rotatable cowl, consisting of a cylindrical part adapted to revole on rollers..."

3 pages of text + 1 drawing which have been disbound from a larger volume.

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