. Earth, sky, and sea . Fig. 17. Magnetic valve controlling the release of the iron pellets a. Tub c. Non-magnetic substance b. Electro-magnet f/. Coils coils of the two valves are normally connected in series and only in parallel during a few seconds at the moment when the pilot wants to stop the outflow of ballast. We give here some numerical data concerning the unballasting of the Trieste. Two ballast tubs, each of which weighs a ton when empty. Contents of each tub : 4-5 tons of iron pellets. Diameter of the outlet [ 154 ]

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