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Fly on the Wall 

May 30, 2008

Is Earth still rotating?

The Foucault Pendulum, a long-time favorite at the old Academy, returns as the first exhibit to be installed in the new Academy’s east wing.

Its first swings demonstrated that yes, in fact, Earth is still rotating (whew!). So how exactly does a pendulum demonstrate Earth’s rotation? Find out here.

In the video clip below, the 235-pound brass ball (called a “bob”) has been set in motion for its first test run. It swings constantly in the same direction, while the Earth rotates beneath it. So as the day goes by, the pendulum knocks down pins one by one (seen in the foreground), demonstrating that over the course of 24 hours, the Academy’s floor turns about 220 degrees. At the North Pole, the floor would turn a full 360 degrees in 24 hours, but at San Francisco’s latitude, we see a 220 degree turn. To get your mind around that one, check out this helpful illustration.

Below is the Academy’s original Foucault Pendulum, built in 1951. Since then, the Academy has built 97 other pendulums for museums, universities, etc. all over the world.

Earth science

Filed under: Exhibits — Helen @ 5:36 pm

May 19, 2008

African Hall sneak peak

As the penguin tank at the end of African Hall is prepped for its full-time inhabitants, the other 20 dioramas in the Hall are also taking shape. Working from detailed photographs of the original works (below, left, on the table), artist Marc Nicely has recreated the diorama backdrops in his Novato workshop, and is now on-site at the new Academy installing and putting the finishing touches on his work. Next up, the rockwork and foliage will be installed in the foreground…

Filed under: Exhibits — Helen @ 9:09 am
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