Duhamel, Le Duc, fl1822 - 1828 (petitioner to the Board of Longitude)
Found in 5 Collections and/or Records:
Letter from Le Duc Duhamel to the Board of Longitude, 1822-02-25
Six letters and two papers on his method of ascertaining the exact loss or gain of two chronometers, with a related newspaper extract.
Letter from Monsieur Duhamel, 1820-08-14
Two letters and a printed paper on finding the longitude by the moon's transit or distance from the meridian.
Letter from Monsieur Duhamel to Dr Thomas Young, 1820-05-03
Two letters and a printed paper on finding the longitude by the moon's transit or distance from the meridian.
Monsieur Duhamel on an instrument for showing magnetic variation, 1820-05-15
Correspondence regarding the effect of magnetic variation on the mariner's compass, the use of magnetic variation to establish longitude and the cause of magnetic variation.
Printed paper outlining Duhamel's two new methods of ascertaining longitude, 1820-08-14
With an illustration.
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