An idea of how much thought and planning went into the Dowding system is shown in this. The plotting clock, showed people looking at the plot how old the information they were looking at was, updated every 5 minutes.
Information received by the Group Operations Room concerning the height, bearing and strength of approaching hostile aircraft would be plotted on large table maps. Group would then alert the most appropriate or its subordinate Sector Operations Rooms, who would take charge of the local aerial activity once their squadrons had been "scrambled".
Work in the Group Ops Rooms was hectic. Numerous incoming messages had to be sorted, prioritised and disseminated at speed; late information could send a precious squadron of Hurricanes or Spitfires looking for hostile targets on bearings and at altitudes long since vacated by an enemy raid, which in August 1940 would often be heading for the fighter stations themselves. An instant method of weeding out stale information from current reports was therefore devised.
All fresh reports would be colour coded either red, yellow or blue according to the time they were received, using this special clock which had its dial painted with the trio of colours at five-minute intervals in succession around the dial.
The colour indicated by the minute hand at the time the report was received would be the colour given to the message and plotted on the Operations Room table map.
Thus ensuring that the Controller remained in full command of the developing battle."
Miscellanea
Information received by the Group Operations Room concerning the height, bearing and strength of approaching hostile aircraft would be plotted on large table maps. Group would then alert the most appropriate or its subordinate Sector Operations Rooms, who would take charge of the local aerial activity once their squadrons had been "scrambled".
Work in the Group Ops Rooms was hectic. Numerous incoming messages had to be sorted, prioritised and disseminated at speed; late information could send a precious squadron of Hurricanes or Spitfires looking for hostile targets on bearings and at altitudes long since vacated by an enemy raid, which in August 1940 would often be heading for the fighter stations themselves. An instant method of weeding out stale information from current reports was therefore devised.
All fresh reports would be colour coded either red, yellow or blue according to the time they were received, using this special clock which had its dial painted with the trio of colours at five-minute intervals in succession around the dial.
The colour indicated by the minute hand at the time the report was received would be the colour given to the message and plotted on the Operations Room table map.
Thus ensuring that the Controller remained in full command of the developing battle."
Miscellanea
Last edited: