“Listen,” Garry drew up a chair by the table, “Don, your knowledge of angles, and the things you had to study about angle of attack of a wing, and angles of incidence of air and wing, and all that, ought to help out here. This seems to be a question of angles.”
“It does,” Chick agreed. “What’s more, Garry, you’ve studied about light, because I know the control chief gave you some books when he saw that you took an interest in his work.”
“Maybe we can both get something out of what we’ve learned,” Don admitted. “Now—how?”
“Well,” Chick offered an opinion, “the old Indian gave us passes that showed us ‘how’ the ghost could be worked. Maybe there is a clue to ‘where from.’”
“Yes—I think there is!” Don caught a fresh sheet of paper, and began to draw a rough diagram of the theatre stage, sketching in the position of the pillar of smoke broadly.
“From what we’ve proved, about tonight, the stage picture couldn’t have come from the wings,” he stated. “It would have to fall on the smoke from the front, almost, or else the people in side seats might see it and not those in direct line, from in front of it.”
Garry drew the sheet to him, made an addition, showing the projection room of the Palace, up on its balcony.
“The theatre was made very dark,” he said, “and all the light on the stage was adjusted so that the sunset died out when the pillar of smoke went upward. Then the man at the film projectors in the balcony ‘faded in’ the picture—from in front, and at an angle ‘above’ the audience.”
Don jumped up, upsetting his chair in his excitement.
“Knowledge is Power!” he cried, excitedly. “Study of angles has given us the answer to Chick’s ‘where from!’ That shows why there is a helicopter hidden in the marsh!”