"Did you use the elevator then?"
"No, I seldom use it." Whitney twisted about in his chair. "I had the elevator installed for the convenience of my wife and daughter."
Penfield made an entry in his notebook, then faced Whitney directly.
"Have you in connection with your workshop a photographic outfit and darkroom?" he asked.
"I have."
"I am told that you are working on a sort of camera which, used in an aeroplane, makes a map of the country over which the machine passes. Is that correct, Mr. Whitney?"
"Yes," acknowledged Whitney. "A patent is pending."
"Had it gotten about among your servants that you were working upon an important invention?"
"It's very possible," Whitney conceded.
"Did Julie, your wife's maid, ever evince undue curiosity in your work?"