Editing LSWR N15 class (section)

===Smoke deflector experiments===
In 1926, the N15 class became the first in Britain equipped with [[smoke deflector]]s, with several designs tested.<ref name=Holcroft462-89>Holcroft (1942), pp. 462–489</ref><ref name=Swift-32>Swift (2006), p. 32</ref> Experiments were undertaken throughout 1926 and included the fitting of a curved plate above the smokebox of No.&nbsp;E753 ''Melisande'' to channel air from below the chimney to lift the exhaust above the locomotive when on the move.<ref name=Haresnape56>Haresnape (1983), p. 56</ref> Nos.&nbsp;E450 ''Sir Kay'' and E783 ''Sir Gillemere'' had air scoops attached to the chimney, whilst E772 ''Sir Percivale'' was fitted with large, square German-type smoke deflectors.<ref name=Haresnape55-59>Haresnape (1983), pp. 55–59</ref> Finally, No.&nbsp;E453 ''King Arthur'' was fitted with small, rectangular smoke deflectors fitted to the handrails on the smokebox sides.<ref name=Haresnape55>Haresnape (1983), p. 55</ref> The experiments produced mixed results, and Maunsell requested the assistance of the [[University of London]] in staging [[Wind tunnel|wind tunnel tests]] .<ref name=Bradley48 /> These resulted in a standard plate design (illustrated in the infobox), which was gradually fitted to the class from late 1927 onwards.<ref name=Swift-32 />