National Geographic : 1955 Apr
Camera - Electronic flash- . ,. ^ Vane to stabilize sled Cable to ship SLED CAMERA cruises safely ing pictures automatically eve r, click- The Author's Electronic Flashes Throw Light on Sea Floors Dark Since Time Began Dr. Edgerton adapts his basic camera and flash units to varied uses. Sonar camera (1) has a mercury switch to indicate when bottom has been reached. Close-up camera (2) photographs tiny marine creatures at any depth down to 6,000 feet. Camera towed on sled (3) traverses miles of oceanic terrain. External cameras on cruising bathyscaphe (4) can be operated by push button within the sphere. Drag chain / . .