Summary of tidal observations in Indonesia, by W de Constant Rebecque and Engelbertus Lucas Report headed: 'Beknopt overzigt van den waarnemingen der water getijen in den Nederlandseh Oost Indieschen Archipel gedaant gedurende het jaar 1839; ingevolge Besluit van Zijne Excellentie den Gouverneur ddo 20 October 1838 No.3.' [Brief summary of the observations of the water tides in the Dutch East Indian Archipelago during the year 1839; in accordance with the Decree of His Excellency the Governor dated 20 October 1838 No.3.]. Signed 'E. Lucas', as Rear-Admiral, Commander...Zeemacht in the East Indies, and Inspector of the Navy; and by W. de Constant Rebecque, lieutenant and adjutant. 1839