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[[File:ARTS1914Plate11.jpg|thumb|400px| [[Robinson's Disc]]{{INF}} added to 2390 to set course of enemy as expressed as inclination.{{ARTS1914|Plate 11}}<br>Note the lack of any graduations on the sighting arm.]] The '''Torpedo Director Pattern 2390''' was a British [[Torpedo Director]] available by 1912 at least, and supplied to torpedo craft with heater torpedoes. ==Design== It was similar to the [[Torpedo Director Pattern 1895|Pattern 1895]], but graduated for higher torpedo and enemy speeds.<ref>''Torpedo Drill Book, 1912'', p. 494.</ref><ref>''Torpedo Drill Book, 1914'', p. 564.</ref><ref>''Handbook of Torpedo Control, 1916'', p. 16.</ref> It would be mounted directly on the tube, and was a suitable substitute for an 1895 or 1193.<ref>''Addenda (1911) to Torpedo Manual, Vol. III., 1909'', p. 170.</ref> It was not circular, and probably a 60 degree arc like the 1895.<ref>''Handbook of Torpedo Control, 1916'', p. 16.</ref>{{INF}} It lacked graduations on its sighting arm, but by 1916 at least, they sported [[Robinson's Disc|inclination discs]]. The Pattern 2390a had more rigid pivots, sturdier construction, and a sighting arm that was solid rather than slotted, and made of hard rolled brass.<ref>''Handbook of Torpedo Control, 1916'', p. 16.</ref> They were often 2390s that had been repaired to the new standard and also featured a pinion for enemy speed adjustment with diagonal rather than rectangular teeth, making a smoother adjustment.<ref>''Addenda (1911) to Torpedo Manual, Vol. III., 1909'', pp. 170-171.</ref> ==Alterations== In 1913, it was being considered whether the 2390a directors should incorporate the graduated sight bar, enemy course indicator disc and other improvements that had since appeared in the [[Torpedo Director Pattern 2380|Pattern 2380]]. The 2390a directors (along with patterns 2380 and 2380a) were probably adapted into [[Torpedo Deflection Sight]]s around 1916, receiving radium foresights as part of their conversion.<ref>''Annual Report of the Torpedo School, 1916'', pp. 25-6.</ref> Apparently, there was a Torpedo Order 56 of June 1914 that mentioned this device on page 65.<ref>''Annual Report of the Torpedo School, 1914'', p. 7.</ref> ==See Also== {{refbegin}} *[[Torpedo Director]] {{refend}} ==Footnotes== {{reflist}} ==Bibliography== {{refbegin}} {{refend}} {{TorpedoDirector}}

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