With an average load of only 50 patients each year between 1902 and 1912 it cannot be said that the nursing staff were overworked. But from this small base the hospital's fortune and revenues grew steadily to such a point that in 1912 a new wing was built. The new building was funded partly by public subscription and by a 500 baht donation from Siam's Anglophile King Vajiravudh. The King Chulalongkorn Wing housed an operating theatre and a maternity ward and was opened by King Vajiravudh on 23 July 1912.