With the advent of relaxant agents in anaesthesia, making direct laryngoscopy easier, the employment of endotracheal anaesthesia has increased rapidly during the past decade.Laryngoscope design has been modified to simplify further the manceuvre of laryngoscopy (Macintosh, 1943), and the position of the head and neck which brings the axes of the larynx, pharynx, and mouth into line has been described (Bannister and Macbeth, 1944;Gillespie, 1948)
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