The Sherringham ventilator
The Sherringham Ventilator is a simple inexpensive method of ventilating a room. An opening is made in an external wall and faced with an air brick or grating. The iron ventilator box is fitted into the hole from within the room, with its hinged valve flap arranged so that the incoming air is directed upwards.
A heavy piece of iron pressing against the valve from within the box, tends to keep it constantly open. By means of a string and pulley, the valve can be opened or closed at will, or fixed in any intermediate position. 1
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Sussex District Lunatic Asylum, Hayward's Heath
Victorian Turkish Baths: their origin, development, and gradual decline
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