"Injector to fill up the boiler."
"Oh," said Bobbie, mentally registering the fact to tell the others; "that is interesting."
"This 'ere's the automatic brake," Bill went on, flattered by her enthusiasm. "You just move this 'ere little handle—do it with one finger, you can—and the train jolly soon stops. That's what they call the Power of Science in the newspapers."
He shewed her two little dials, like clock faces, and told her how one shewed how much steam was going, and the other shewed if the brake was working properly.
By the time she had seen him shut off steam with a big shining steel handle, Bobbie knew more about the inside working of an engine than she had ever thought there was to know, and Jim had promised that his second cousin's wife's brother should solder the toy engine, or Jim would know the reason why. Besides all the knowledge she had gained Bobbie felt that she and Bill and Jim were now friends for life, and that they had wholly and forever forgiven her for stumbling uninvited among the sacred coals of their tender.
At Stacklepoole Junction she parted from them with warm expressions of mutual regard. They handed her over to the guard of a returning
