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My second is performed by my...

My second is performed by my first, and, it is thought, a thief by the marks of my whole might be caught. What am I?

Correct answers: 24

The first user who solved this task is Djordje Timotijevic.

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Slow Clock

My wife complained that the kitchen clock had nearly killed her mother, as it fell off the wall seconds after where she had been sitting underneath it.
That darn clock has always been slow.

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Quaternions

In 1843, the theory of quaternions was born when a sudden thought came to William Rowan Hamilton (1805-1865) as he was walking with his wife along the Royal Canal in Dublin, Ireland. (He had been working since the late 1830s on the basic principles of algebra, resulting in a theory of conjugate functions, or algebraic couples, in which complex numbers are expressed as ordered pairs of real numbers. Until now, he had not been successful in developing a theory of triplets that could be applied to three-dimensional geometric problems.) During the walk, he realized that the theory should involve quadruplets, not triplets. His excitement at his discovery caused him to pause and carve the underlying equations in a nearby bridge.

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