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By Allison S. K., Duane W.

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In the face of this revolt from below, Napoleon, on the eve of his disastrous invasion of Russia, returned France to the Paris measures of the Ancien Régime. Now he mocked the global aspirations of the men he had once admired. ” Not until the middle of the nineteenth century did France revert to the metric system, and even then use of the old measures persisted into the twentieth. It would take enormous scientific effort and years of bitter conflict to make metric measurement banal, just as it had taken a Revolution to bring the metric system into being.

Delambre discovered that the first ten steps of the staircase had crumbled away, and though he sent a workman up to verify the view, he had no appetite for hoisting himself and his instruments up the ninety-six-foot turret. He settled for an observation point on the overgrown fortification wall below. Next, Delambre visited the Malvoisine farmhouse, perched on a low ridge twenty miles to the southeast, which had been used by Cassini III in 1740. The site is still a working farm, its muddy courtyard piled with machinery and patrolled by dogs.

While that work got underway, he continued to Dammartin, a town on top of a steep ridge just outside today’s Charles de Gaulle airport. There he learned that the Collégiale chapel, which had served Cassini III in 1740, was about to be sold off as part of the Revolutionary sale of church lands, and the buyer intended to demolish the church for building materials. On the spot, Delambre decided to make this site his highest priority. But first he had to verify that he could see Dammartin from Saint-Martin-du-Tertre, the next station to the north; there too his preliminary observations did not match those of 1740, suggesting that the position of the church belfry had been shifted by several hundred feet at some point during the past fifty years.

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Absorption Measurements of Certain Changes in the Average Wave-Length of Tertiary X-Rays by Allison S. K., Duane W.

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