- Seattle’s Woodland Park Zoo, now regarded as one of the nation’s best, began with a small menagerie on Guy Phinney’s sprawling Woodland Park estate between Phinney Ridge and Green Lake. In 1899, the City of Seattle purchased the estate, and in 1903 John C. Olmsted (1852-1920) designed the first plan for its permanent “Zoological Gardens.” In 1932, construction of Aurora Avenue N (Highway 99) severed the zoo from “lower” Woodland Park. In 1976, neighborhood opposition to improvements authorized by the 1968 Forward Thrust bond election led to a new Long-Range Plan, later implemented by director David Hancocks. The plan’s natural “bioclimatic” exhibits revolutionized zoo design and won numerous international awards. King County voters approved additional zoo improvements in 1985, which were completed in 1999 under the guidance of director David L. Towne.
- Inside the mechanical Bendix Air Data Computer, part 5: motor/tachometers (righto.com)
The Bendix Central Air Data Computer (CADC) is an electromechanical analog computer that uses gears and cams for its mathematics. It was a key part of military planes such as the F-101 and the F-111 fighters, computing airspeed, Mach number, and other “air data”. The rotating gears are powered by six small servomotors, so these motors are in a sense the fundamental component of the CADC. In the photo below, you can see one of the cylindrical motors near the center, about 1/3 of the way down.