Rollo looked where she pointed, and saw the hammer lying there.In the first place, a magnet has a peculiar chauffeur car hire surrey and mysterious attractive power for iron, residing in its two extremities, which are called its poles and the power which resides in one extremity is, in some way or other, opposite in its nature to that of the other extremity.Not exactly, said Mary.What? chauffeur car hire surrey said Rollo.That would be an experiment in intellectual philosophy, said Mary.So Rollo chauffeur car hire surrey went off towards the house to get the cork.In a corner of the yard there was a bench under a tree, and the branches came down pretty low.No, chauffeur car hire surrey said Rollo, we are going to study oscillation.when the large one was moving forward, the small one would be coming back.Yes, said he, and chauffeur car hire surrey the needle and cork run right up that ridge of water.Yes, said Mary, it is very slow, indeed.