View source for Dreyer Table Mark II

From The Dreadnought Project

← Dreyer Table Mark II

You do not have permission to edit this page, for the following reasons:

• The action you have requested is limited to users in one of the groups: Users, editor.
• You must confirm your email address before editing pages. Please set and validate your email address through your user preferences.

---

You can view and copy the source of this page.

The '''Mark II Dreyer Table''' was a variation of the [[Mark III Dreyer Table]] to evaluate the [[Argo Clock Mark IV]] by integrating it with the Dreyer range and bearing rate-plots. Little is known of the particulars of the table. Not even the outer dimensions are specified in the ''Handbook of Captain F.C. Dreyer's Fire Control Tables, 1918''.{{DreyerH|p. 90}} Confusingly, in 1914, these tables were referred to as "Mark III*" tables,{{AWO1914|972 of 27 Mar, 1914}} a designation later given to a different type of table. ==Development== Little detailed information is known of these tables, as they are glossed over in the 1918 Handbook{{DreyerH|p. 15}} to such a degree that it is difficult indeed to feel this wasn't a petulant effort to avoid highlighting the competitor's gear.<ref>The Mark II table receives '''''two sentences''''' in its description and no images whatsoever.</ref> ===Argo Clock=== The Argo clock was connected so its [[Clock Range|clock range]] output caused a commutator to drive an electric motor which then interacted with the Dreyer table in the same manner as did the output shaft of the [[Dreyer-Elphinstone Range Clock]] in the Mark III table.{{DreyerH|p. 15}} ===Spotting Corrector=== This was probably the same as any Mark III table of the same period. ===Range Plot=== This aspect of the table was probably much like that in the Mark III table, and evolved through its service life on the same path. ===Bearing Plot=== I think there was none at all. The 1918 Handbook explicitly says that a [[Standard Bearing Plot|standard bearing plot]] was used, but this should be regarded as being suspect for reason of this device's short-lived tenure before the [[G.D.T.]] replaced it. A post-war Technical History volume says that the ships that had an Argo Clock had no time-and-bearing "table" at all... just a time-and-range one.{{THArgoAndDreyer|p. 12}} ==Deployment== The Dreyer Handbook of 1918 lists some ships with Mark II tables, with those no longer in active service crossed out by hand at some later date, and those lost before promulgation not listed at all. Those appearing in that document are footnoted below<ref name=DreyerP3>''Handbook of Captain F.C. Dreyer's Fire Control Tables, 1918''. p. 3.</ref>. Note that this source would not be expected to show ''Queen Mary'' or ''Audacious'', as they were lost well before it was prepared. Excepting ''Orion'', the shipboard installations appear to have existed by March 1914.<ref name=gfwo>''order NS14083/14, 27 March 1914, ADM 182/5'', thanks to Mark Harris</ref> This source is at slight variance with a schedule of ships listed as those to which Argo Clocks Mark IV would be shipped.<ref name=TH1913>Dreyer & Usborne. ''Pollen Aim Corrector System, Part I. Technical History and Technical Comparison with Commander F. C. Dreyer's Fire Control System, 1913''. p. 3.</ref> it is worth noting that this list was for bare Argo clocks and was a ''forecast'' of equipage. {| border="1" cellpadding="5" cellspacing="0" |- | bgcolor=CEDFF2|'''Ship using Mark II table''' | bgcolor=CEDFF2|'''Date equipped''' | bgcolor=CEDFF2|'''Notes''' |-valign="top" | [[H.M.S. Queen Mary (1912)|''Queen Mary'']]<ref name=TH1913/> | prior to 27 March, 1914<ref name=gfwo/> | |- | [[H.M.S. Conqueror (1911)|''Conqueror'']]<ref name=DreyerP3/><ref name=TH1913/> | prior to 27 March, 1914<ref name=gfwo/> | |- | [[H.M.S. Orion (1910)|''Orion'']]<ref name=DreyerP3/> | ??? | |- | [[H.M.S. Ajax (1912)|''Ajax'']]<ref name=DreyerP3/><ref name=TH1913/> | prior to 27 March, 1914<ref name=gfwo/> | |- | [[H.M.S. Audacious (1912)|''Audacious'']]<ref name=TH1913/> | prior to 27 March, 1914<ref name=gfwo/> | |- | [[H.M.S. Centurion (1911)|''Centurion'']]<ref name=DreyerP3/><ref name=TH1913/> | prior to 27 March, 1914<ref name=gfwo/> | |} ==See Also== *[[Dreyer Fire Control Table]] ==Footnotes== {{reflist}} ==Bibliography== {{refbegin}} *{{BrooksDGBJ}} *{{BrooksThesis}} *{{THArgoAndDreyer}} *{{DreyerH}} {{refend}} [[Category:Dreyer Fire Control Table]] [[Category:Fire Control]] [[Category:Shipboard Equipment]]

Return to Dreyer Table Mark II.