. Earth, sky, and sea . Fig. 18. Diagram of lever supporting the ballast tub by the electro-magnet M. As soon as this magnet lets go, the lever pivots around its axis A and the chain is released. Upon the surface we can, in order to economize the electric current, lock the lever either by means of a pin B or by means of the turn- buckle H. The reason for this double locking is that if it is the pin which retains the lever and if the electro-magnet does not work, the whole right arm of the lever is entirely unloaded. On the other hand, if the turnbuckle is brought into action and the pin is rem
. Earth, sky, and sea . Fig. 18. Diagram of lever supporting the ballast tub by the electro-magnet M. As soon as this magnet lets go, the lever pivots around its axis A and the chain is released. Upon the surface we can, in order to economize the electric current, lock the lever either by means of a pin B or by means of the turn- buckle H. The reason for this double locking is that if it is the pin which retains the lever and if the electro-magnet does not work, the whole right arm of the lever is entirely unloaded. On the other hand, if the turnbuckle is brought into action and the pin is removed, then the lever is subjected to the effect of the load and deflects slightly. The left extremity of the arm FG then moves away slightly from the lever. This movement can be easily measured by means of a little graduated wedge. Since the elastic deformation of the lever is proportionate to its load, our lever plays the part of a dynamo- meter. It thus permits us to measure the quantity of ballast which is [ 156]
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