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• r  by photoelectric means
  they measured it photoelectrically

• Daylight flows through photoelectrically controlled skylights, and this "provides new uses for window walls.
• The panchord is a film-record, having sound waves fixed upon it photoelectrically, capable (largest size) of playing continuously for an hour without "changing the record.
• This can be done by 1) taking high-speed motion pictures of the eclipse, 2) watching photoelectrically for the moment when the light from the sun is weakest, 3) photographing the .