Tidal observations made at Muntok [Mentok], Indonesia, by P J D Keuchenius Daily observations of the tides, arranged on monthly table, at Mentok, Bangka Island, Indonesia. Columns for: date; heights of high water and low water in Dutch yards and English feet and inches [the latter not completed]; tidal range; wind direction and force; turn of stream [not completed]; and general remarks. With fields beneath the main table, for noting the type of timepiece used, and the type of barometer. A printed key is give for wind force abbreviations 0-12. The observations commence with a brief introduction: 'Beschrijving des Peilkokers en bepaling van des zelfs Plaats', [Description of the sounding tubes (eg tide gauge) and determination of its location]. Each sheet is headed in English and Dutch: 'Register of Tides, observed at Muntok...in the month of...' with the month and year added. Signed by the observer, top right: 'P J D Keuchenius'. 15 January-31 December 1839