The US maury collection metadata 1796-1861/Метаданные американской коллекции Мори 1796-1861

Издание на английском языке
This report describes the metadata found in the logbooks of the US Maury Collection (1796-1861) that was digitized in China in the period 1993-1996. Much of the metadata was missed during the digitization process. Although many errors in the Maury dataset have been removed by automatic quality control procedures, some important errors, resulting from incomplete metadata, may still exist. A future reprocessing of the data, based on additional metadata or new error detection procedures, may eliminate those errors. We hope that this report may provide valuable background information for such an attempt. The report may also serve as an example for current and future efforts to digitize historical ship logbooks.
The work described in this report can be considered as an early KNMI contribution toward the RECovery of Logbooks And International Marine data project (RECLAIM). The work is also part of the KNMI-program HISKLIM (Historical Climate; Brandsma et al., 2000) that aims at making historical land and sea climate data from Dutch sources physically accessible, with the highest possible time resolution and quality.

Contents
Table of contents
1. Introduction
2. Keeping the journal at sea
2.1. Log board
2.2. Logbook
2.3. Journal
2.4. Abstract log
2.5. Watches and bells
3. Date and time
3.1. Ship’s time
3.2. The nautical day
3.3. The civil day
3.4. THE astronomical day
3.5. Crossing the date line
3.6. The use of the nautical day after the Brussels’ Conference in 1853
4. Geographical position
5. Current
6. Compass variation
7. Air pressure
7.1. The common marine barometer
7.2. Observation time of the barometer
7.3. Location of the barometer
7.4. Barometric corrections
7.4.1. Capacity or cistern correction
7.4.2. Capillarity correction
7.4.3. Temperature correction
7.4.4. Index correction
7.5. Factors influencing the absolute accuracy of the barometer by the movements of THE SHIP
7.5.1. Free oscillations
7.5.2. Forced oscillations
7.5.3. Height of the barometer above sea level
7.5.4. Gravity correction
7.6. Types of barometers used in the MC
7.7. The sympiesometer
7.8. The aneroid barometer
8. Temperature
8.1. General comments on thermometers
8.2. Dry- and wet-bulb temperatures
8.3. Seawater temperatures
8.4. Temperature at depth
9. Wind direction and force
9.1. Wind Direction
9.2. Wind Force
9.3. Wind force conversion scales
10. Weather abbreviations
11. Abbreviations
12. References
Appendix I: Foreign abstract logs
Appendix II: Leagues, nautical miles, fathoms