Just fetched out my copy of Dreadnought Gunnery and The Battle of Jutland The Question of Fire Control by John Brooks, it's a heavy read but I have found out the following about fire control in Dreadnought type battleships:
By 1906, the supply of almost all the fire control instruments for Dreadnought had been arranged. However, after successful experiments aboard Duke of Edinburgh, it was decided that, in future, the clocks and range and deflection transmitters to the individual turrets should be moved below to a transmitting station (TS), protected by armour, near the base of each mast. The TS would be connected by a large voice pipe to its top, where the range finder and Dumaresq remained, 'the initial range and spotting corrections and deflection' being passed by voice popes and the 'rate' by special electrical transmitters.
In the TS of the first Dreadnoughts , a clock operator would 'call the 25s and also call the range every time a full hundred yards is reached' while the transmitter men (one per turret) would rotate the transmitter handles at each 25-yard step. At the guns, the sight-setters then had to read the ranges and deflections off the receivers and set the sights accordingly, although, by 1909, they had provided with telephone headsets, through which they hear the range steps being called in from the TS.
As I said it's a complicated book and I'll scan through it to find further information