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History tells us that William, Abbott of Hirschau, who died toward the end of the eleventh century, invented a horologium modeled after the celestial hemisphere; therefore he may have been the inventor of the clock, for soon after his death these striking bells begin to make their appearance on church towers and in other religious buildings.

From 1665 to 1681, accepting the tempting offer made him through Colbert, by Louis XIV., Huygens pursued his studies at the Bibliotheque du Roi as a resident of France. Here he published his Horologium Oscillatorium, dedicated to the king, containing, among other things, his solution of the problem of the "centre of oscillation." This in itself was an important step in the history of mechanics.

It is not necessary here to explain how the difficulties were overcome; the reader may be referred to the article "Horologium" in the Dictionary of Antiquities, and especially to the cuts there given of the dial found at Tusculum in 1761.

"Somehow it's a bit tough to get this linking-up idea just when I can't do any more studying," added the boy a trifle wistfully. "Oh, you will be back at school before long, son; and if you go back more eager to learn will that not be a gain?" "Sure it will! Hora! Jove! I made a neat guess, didn't I? And that's where that horologium you were talking about came from, too. I'm not so worse.

Post commutatorem sedet horologium terrificum, behind the commuter rideth the alarm clock, no sooner hath he attained to the office than it is time for lunch, no sooner hath lunch been dispatched than it is time to sign those dictated letters, no sooner this accomplished, 'tis time to hasten trainward.