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The object below is the gear for a lock of the dam at Carnegie Lake in Princeton, NJ. The dam was completed in 1906, so the gear must be 107 years old.

I took the photo with a Canon 50mm f/1.4 lens which is one of my favorites. I had to use a tripod in the waning light of an autumn day with the following camera settings: ISO 100, aperture f/11, shutter speed 0.5 sec. 

CarnegieLakeLock__MG_2181

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