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XXIX ESC General Assembly, Sept. 12-17, 2004 - GFZ

XXIX ESC General Assembly, Sept. 12-17, 2004 - GFZ

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O. HECKER´s sea gravity meter<br />

Now technical monument in the Munich<br />

German Museum<br />

• Developed on the recommendation of<br />

F. R. HELMERT and financed by the<br />

International Earth Measurement<br />

• Derives the gravity value from the<br />

difference between gravity dependent<br />

air-pressure values of mercury thermometers<br />

and gravity independent boiling<br />

point thermometers<br />

• between 1901 and 1909 used for extended<br />

measurementson the Atlantic, Indic and<br />

Pacific Ocean with accuracy of ± 30 mGal.<br />

Confirmed:<br />

→ Airy & Pratt hypothesis of isostatic<br />

equilibrium<br />

→ Helmert´s normal gravity formula<br />

→ Strong gravity anomalies in the Indic<br />

Ocean and over deep sea trenches<br />

Peter Bormann <strong>XXIX</strong> <strong>ESC</strong> <strong>General</strong> <strong>Assembly</strong>, <strong>Sept</strong>. <strong>12</strong>-<strong>17</strong>, <strong>2004</strong>

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