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History of Oceanography
The Early Instruments Collections
Figure 73. Thoulet device for measuring the virtual density of large samples.Julien Thoulet described this method in 1905 for determining the apparentdensity of pumice stones, in order to better understand the origin of theserocks which were found i
Figure 74. Device for determining the amount of carbon dioxide in a water sample. This is a Schoedter apparatus which is still used today. A sample is treated with hydrochloric acid which transforms carbonates into chlorides at whichtime carbon di
Figure 75. Device for determining the color of bottom samples. This device was conceived and described by Julien Thoulet in 1910.
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