Came across this link on BoingBoing about a film about the 1939 World's Fair. It's The Middleton Family at the New York World's Fair" and available through archive.org. I watched some of it. Can't say it was worthwhile.
One of the things it mentioned was the time capsule buried then, to be opened in 5,000 years. The term time capsule was invented specifically for it, though the practice is older. How will the people of the year 6939 know about the time capsule? One way was to publish a book, with copies sent to libraries and archives around the world, titled The Book of Record of The Time Capsule. On acid free paper that should last a long time, with copies distributed widely, in the hopes that in the deep future someone will come across it and think to find and open the capsule.
I read part of the book. It's in the somewhat florid style of the time, which I think gets its influence from oratory.
By A.D. 6939, it is probable, all present-day landmarks, city surveys, and other such aids for locating such an object will have disappeared. The spot may still be discovered, however, by determination of the latitude and longitude. The exact geodetic coordinates [North American Datum of 1927J are :Latitude 40° 44' 34". 089 north of the Equator Longitude 73° 50' 43".842 west of Greenwich
I'm writing this only 68 years in the future. There are people still alive who were at that fair. I could find the capsule's location in many ways, but I decided to use the lat/long. Using Google maps I see it's in Flushing Meadows Park, which is also where other sources say it is. But it's very close to some limited access roads and doesn't appear to be anything at the spot.
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