were carefully made, of different layers of wood "built up" as they are called, to make them stronger. They were eight feet in diameter, and driven by a twenty-cylinder, air-cooled, motor, whirled around at the rate of fifteen hundred revolutions a minute. When operated at full speed the airship was capable of making eighty miles an hour, against a moderate wind.
But if the use of the peculiarly-shaped planes and the gas container, with the secret but powerful vapor in it were something new in airship construction, so was the car in which the operator and travelers were to live during a voyage. It was a complete living room, with the engine and other apparatus, including that for generating the gas, in a separate compartment, and the whole was the combined work of Tom and Mr. Sharp. There were accommodations for five persons, with sleeping berths, a small galley or kitchen, where food could be prepared, and several easy chairs where the travelers could rest in comfort while skimming along high in the air, as fast as the fastest railroad train.
There was room enough to carry stores for a voyage of a week or more, and enough gas could be manufactured aboard the ship, in addition to that taken in the aluminum case before starting,
