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If we can get the density of this instrument just right, it will sit neither sinking nor floating. Now that's easy to say but it's actually a considerable challenge to do... They weigh about 100 kilograms and we need to ballast them to approximately better than one gram. So that's a considerable challenge. The way that we do that is by putting them in tanks of water... and adding weights until they're just sinking; at which point we know they have the same density as the water that they're sitting in.

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