At Pisa in Northern Italy, Roald Amundsen is testing the two special machines built by the German designer Dormier. In a few days he will fly north by way of Zurich, through Germany and Norway to Spitzenbergen. Thence to the North Pole and Alaska. In the barren wastes of polar territory, a forced landing means almost certain death.

Motor failure is provided for by using two motors, one behind the other, placed on top of the wing, each driving its own propeller. In an ordinary twin engine airplane, with the engines placed one...

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