| 1. | At the topmost level was FCHQ filter room, located at Bentley Priory.
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| 2. | Each filter room was attached to a Fighter Command Plotters, Filterers and Controllers.
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| 3. | Lascaris was furnished with a Filter Room, Gun Operations Room and Fighter Control Room.
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| 4. | The raw water is let in to the filter room slowly from the pipe on the right.
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| 5. | The Filter Room contained a map table showing the British coast from north Wales through western Scotland.
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| 6. | This process of combining information was called " filtering " and took place in seven Filter Rooms.
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| 7. | The Filter Room displayed information received from various places, including the naval station at Auberge de Castille.
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| 8. | This information would also flow into the filter room but they were not connected to the plotters on the floor.
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| 9. | Built in the 19th century, the Sharps enlarged it and converted it to house a pool and a filter room.
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| 10. | The same target as reported from two different stations could appear in very different locations on the filter room's plot.
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