Their hearts jumped with hope at this.  So everything was made tight in the cabin, with the straps and fastenings which had been provided when the machine was made.  Even Grandpa had to submit to being roped up in one of the swinging hammocks.  When the boys had buckled themselves down to their seats, John gave Tom the word, and he began to rise slowly.  At close to two thousand feet he brought the Sky-Bird quickly and smoothly upward until she stood almost on her tail end.