During those two days he learned many other things, to be sure: that Aten for instance, was relieved from duty at the machines only because he was wounded; that the power of the main machines came from a deep bore which brought up superheated steam from the source of boiling springs long since built over; that iron was a rare metal, and consequently there was no dynamo in the city and magnetism was practically an unknown force; that electrokinetics was a laboratory puzzle or had been, when there was leisure for research while the science of electrostatics had progressed far past its state on Earth.
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