[clarification needed] He also studied in France and Netherlands in the School of engineering of digging dam-canals.

[citation needed] He returned to Thailand in 1904, working as a military engineer and officer of the Siamese Royal Army.

He developed the Siamese Department of Engineering militaries[clarification needed] using knowledge gained from his Western education.

Until his death in 1910, starting the new reign of King Vajiravudh (Rama VI), he requested his stepbrother, Prince Purachatra Jayakara to be the Head of the Northern railway department.

He hired the American Geologist to work as surveying in geological system, for finding crude oil and coal around Thailand.

He considered about establishing the television broadcasting transmission, which would have made Siam the first country in Asia to experiment with television, and had contacted an American company to provide and install equipment; however, because of the Siamese Revolution of 1932, the project was cancelled.

[1] He firstly married on 16 November 1904 with his cousin, Princess Prabhavasit Narumon, daughter of the Chaturonrasmi, the Prince Chakrabadibongse, King Chulalongkorn's younger brother.

[1] The couple had 4 children; 1 son and 3 daughters; He secondly married with a Chiang Mai's princess, Chao Ladakham, had 2 daughters; Mom Pian Chatrajaya na Ayudhya (née Surakup; 1 September 1899 – 14 July 1938), had 1 daughter; Mom Pued Chatrajaya na Ayudhaya (née Pheungrakwong; 12 June 1906 – 5 March 1984), had 1 son; Mom Buaphud Chatrajaya na Ayudhya (née Intrasut; born 5 April 1911), had 1 son and 1 daughter; Mom Chamlong Chatrajaya na Ayudhya (née Chalanukroh; 8 September 1913 – 4 November 1968), had 1 daughter; Mom Euam Chatrajaya na Ayudhya (née Aruntat; 14 October 1910 – 16 February 1948), had 1 son; Chakri dynasty Kings Viceroys Deputy Viceroy Crown Prince Hereditary Prince Royalty Siamese Foreigners Key events