Cardona produced them.
One sheet bore a short, written reference that said, “Model.” Beneath it were these words:
Keys to arrangements are in drawer E.
“Drawer E,” said Biscayne thoughtfully. “Where is that? Ah! I recall! There are some drawers in the workshop. They are designated by letters. Will you find it, Cardona?”
“Sure,” said the detective.
He was starting for the door when Biscayne called him.
“Wait,” said the professor. “I’ll go with you. There may be something else, of importance in there. You can keep looking after I come back to continue with my experiments.”
As he reached the door, Biscayne turned thoughtfully and pointed to the model on the floor.
“That plug is evidently arranged for an electrical connection,” he remarked. “If you screw it into the outlet by the table, it will save time.”
Commissioner Weston picked up the model and carried it carefully toward the wall.