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Visual Interlude: Speaking Clocks

Andrew Bernardin on June 25th, 2011

Clock's tell time.

What does the clock say?

Before knowing the origin of clocks, I found those two expressions curious. A clock on the wall doesn't "say" anything. Nor does it strictly "tell" us something. Rather, we read a clock.

As in the photograph below, the first "clock" (the first . . . event synchonizer and duration measurer?) was the position of the sun in the sky. Which is fully mute, at least from this distance. Later, much later, came the mechanical clock. And suddenly, clock's could "speak." The etymology of the term reveals:

late 14c., clokke, originally "clock with bells," probably from M.Du. clocke (Du. klok), from O.N.Fr. cloque, from M.L. (7c.) clocca "bell," probably from Celtic (cf. O.Ir. clocc, Welsh cloch "bell") [source]

Clock bells are struck. They resound. We don't need to read them, we listen . . . one, two, three.

astrolabe

[photo thanks to NASA]

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May

My Brain Hurts – In a Good Way

Andrew Bernardin on May 11th, 2011

I love physics, despite the fact that so much of it is puzzling if not outright Greek (the equations in particular). And I am a fan of the television serious "The Big Bang." My same inner nerd enjoyed encountering the below image and, even more, the explanation of it -

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Does gravity have a magnetic counterpart? Spin any electric charge and you get a magnetic field. Spin any mass and, according to Einstein, you should get a very slight effect that acts something like magnetism. This effect is expected to be so small that it is beyond practical experience and ground laboratory measurement. In a bold attempt to directly measure gravitomagnetism, NASA launched in 2004 the smoothest spheres ever manufactured into space to see how they spin. These four spheres, each roughly the size of a ping-pong ball, are the key to the ultra-precise gyroscopes at the core of Gravity Probe B. Last week, after accounting for persistent background signals, the results were announced -- the gyroscopes precessed at a rate consistent with the gravitational predictions of Einstein's General Theory of Relativity. The results, which bolster existing findings, may have untold long term benefits as well as shorter term benefits such as better clocks and global positioning trackers. [source]

Spin an electric charge and you generate magnetism. Spin some mass and you . . . get something like gravity??? Cool! Double cool! Cool to the power of Pi!

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Jan

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Andrew Bernardin on January 25th, 2011

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[photo thanks to NASA]

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Andrew Bernardin on January 6th, 2011

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The unusual shape of the Red Rectangle is likely due to a thick dust torus which pinches the otherwise spherical outflow into tip-touching cone shapes. [NASA]

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In what way or ways does a nebula exist as a single, independent-of-an-observer entity?

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Andrew Bernardin on November 30th, 2010

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