Dreyer Table Mark I*
The Mark I* Dreyer Table was a moderately improved version of the Mark I table. It added a helm-free capability and a more comprehensive means of outputting gun range. The few ships to receive it were completed too late to see wartime service.
The Mark I* was very nearly identical to the Mark I table, with 2 exceptions:
- The Mark I* added a gyro-compass input to keep own heading updated on the dumaresq as was done first on the Mark III table.
- The Mark I*'s gun range was conveyed to a Range Master Transmitter on the T.S. bulkhead.
Its dimensions were almost the same as those of the Mark I table, except the worm shaft bringing in gyro-compass data to the dumaresq added almost 2 feet to the height:
|Width||5 feet, 8 inches|
|Depth||5 feet, 1.5 inches|
|Height of Range Rate Grid||3 feet, 4 inches|
|Height of top of dumaresq||5 feet, 9 inches|
Whether any of these tables were placed in ships, and for how long, seems unclear, though five to seven ships appear possible. In 1918, two coastal battleships just reaching completion and five as-yet incomplete cruisers are noted as planned to receive the tables, but the three of these vessels that survived to 1930 are then noted as having other Marks.
Aside from two deployed in monitors, the Mark I* tables were primarily to be deployed to Hawkins class cruisers completed after the war. As the cruisers were all completed postwar and the monitors completed in the last weeks of the war, the Mark I* table is a historical footnote in World War I naval history, and it is possible the cruisers never received the tables, as by 1930, Hawkins was noted as carrying a Mark IV* table, and
If any ships were so equipped, the lateness of their supply means it is likely that they boasted the latest refinements from first installation, such as a Standard Bearing Plot or G.D.T. for their bearing side, and a range typewriter for plotting ranges[Inference].
|Ship using Mark I* table||Date equipped|
|Glatton||Perhaps upon completion,[Inference] out of service prior to 1930 source documents|
|Gorgon||Perhaps upon completion,[Inference] lost very soon thereafter|
|Effingham||Perhaps on completion,[Inference] by 1930 had Dreyer Table Mark III*|
|Frobisher||Perhaps on completion,[Inference] by 1930 had Dreyer Table Mark III*|
|Hawkins||Perhaps on completion,[Inference] by 1930 had a Dreyer Table Mark IV*|
|Raleigh||Perhaps on completion,[Inference] lost before 1930 source documents|
|Cavendish||As this ship was completed as an aircraft carrier, doubt about her Dreyer equipment is greater still.|
- Handbook of Captain F.C. Dreyer's Fire Control Tables, 1918. p. 3.
- Admiralty. Pamphlet on the Mark III* Dreyer Table, 1930, p. 1.
- Admiralty Pamphlet on the Mark IV* Dreyer Table, 1930, p. 6.
- Admiralty, Gunnery Branch (1918). Handbook of Captain F. C. Dreyer's Fire Control Tables, 1918. C.B. 1456. Copy No. 10 at Admiralty Library, Portsmouth, United Kingdom.
- Brooks, John (2005). Dreadnought Gunnery and the Battle of Jutland: The Question of Fire Control. Oxon: Routledge. ISBN 0714657026. (on Amazon.com and Amazon.co.uk).
- Brooks, John (2001). Fire Control for British Dreadnoughts: Choices of Technology and Supply. Unpublished PhD Thesis. London: Department of War Studies. King's College, London.