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[[File:MysteryDeviceInBritishSpottingTop.jpg|thumb|240px|'''Mechanical Aid-to-Spotter'''<br>Or possibly an Evershed or Elliott bearing transmitter.]] The '''Mechanical Aid-to-Spotter''' was designed by {{LieutRN}} [[Willie Dickson Kilroy|W. D. Kilroy]] to ensure that the [[Spotting Officer|spotting officer]] was watching the same target as was being fired upon by his own ship. ==Mark I== :[[Mechanical Aid-to-Spotter Mark I|<small>Main article</small>]] The need for these instruments was envisioned in early 1916. It seems likely that supply commenced in late 1916 at the earliest.{{FCHMShips|pp. 25}} The first version was deployed in 22 of the earlier dreadnoughts and battlecruisers.<ref>''Manual of Gunnery for HM Fleet, Volume III, 1920'', p. 34.</ref> ==Mark II== :[[Mechanical Aid-to-Spotter Mark II|<small>Main article</small>]] This device is detailed in ''Manual of Gunnery for HM Fleet, Volume III, 1920''.<ref>''Manual of Gunnery for HM Fleet, Volume III, 1920'', pp. 35-37, Plates 45, 47, 49, 51.</ref> Supply of these to the latest capital ships commenced in the early months of 1919,{{FCHMShips|pp. 26}} and by 1920, 22 had been equipped.<ref>''Manual of Gunnery for HM Fleet, Volume III, 1920'', p. 35.</ref> ==Mark II*== :[[Mechanical Aid-to-Spotter Mark II*|<small>Main article</small>]] This device is detailed in ''Manual of Gunnery for HM Fleet, Volume III, 1920''.<ref>''Manual of Gunnery for HM Fleet, Volume III, 1920'', pp. 37-39, Plates 52-55, 59, 60.</ref> Most often mounted in light cruisers from June 1918; an installation was generally a pair mounted on each side of the fore top.<ref>''Manual of Gunnery for HM Fleet, Volume III, 1920'', p. 37.</ref>{{FCHMShips|pp. 26}} ==See Also== *[[Spotting]] *[[Evershed Bearing Indicator]] *[[Usborne Fall of Shot Indicator]] ==Footnotes== {{reflist}} ==Bibliography== {{refbegin}} *{{FCHMShips}} * Handbook for this device (not read by me) C.B. 1285 {{refend}} [[Category:Fire Control]] [[Category:Shipboard Equipment]]

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