ten o'clock
As needed , the liquid hydrogen jars , coated with mercury , were to be taken from their casings and carried to the bridge where the reconverter was located . Aft of the engine cabin was the store room for water and provisions . The grooves and rods for the counterweights and equilibrium adjuster ran in the middle of the upper footway and the propeller shaft rested on the bottom of the forward section of the car . At ten o'clock that evening all the work on the car was finished except the buckling on of the aluminum silk sides and the hanging of the propeller , the rudder and the aeroplane sides . It was as long and as hard a day 's work as either of the boys had ever done . They were dead tired , but happy , and after a sousing wash-up they got into their pajamas and , throwing their blankets on the floor of the little office , were soon fast asleep . In spite of his fatigue Ned did not sleep soundly .