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Knight's Mechanical Encyclopedia (ed. Knight) 2 0 Browse Search
Thomas Wentworth Higginson, Cheerful Yesterdays 2 0 Browse Search
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Knight's Mechanical Encyclopedia (ed. Knight), S. (search)
10 = 100,000 square links = 1 acre. Surveyor's-chain. The chain is divided every 10 links by notched brass marks, so that the fractions may be readily distinguished. Chains 100 feet long, divided into 1-foot links, are also used by civil engineers. Other apparatus is used where extreme accuracy is required. The decempeda, or 10-foot pole, was the standard land-measure of Rome. The base line for the trigonometrical survey of Great Britain was laid down by General Roy on Hounslow Heath, and is 5.2 miles long, nearly. It was measured at first with pine rods; but as these were found to be affected by the hygrometrical changes of the atmosphere, it was again measured with glass tubes 20 feet in length, furnished with a peculiar apparatus for making the contacts. In the subsequent measurement of the same line for the Ordnance Survey, two steel chains of 100 feet in length, and made by Ramsden, were employed. One of these was kept as a measuring-chain; the other was kept
Thomas Wentworth Higginson, Cheerful Yesterdays, V. The fugitive slave epoch (search)
ourtesy, were even more anxious than usual that I should not miss the train. In Boston, my friend Richard Henry Dana went with me to the marshal's office; and I was seated in a chair to be looked over for identification by the various officers who were to testify at the trial. They sat or stood around me in various attitudes, with a curious and solemn depth of gaze which seemed somewhat conventional and even melodramatic. It gave the exciting sensation of being a bold Turpin just from Hounslow Heath; but it was on a Saturday, and there was something exquisitely amusing in the extreme anxiety of Marshal Tukey--a dark, handsome, picturesque man, said to pride himself on a certain Napoleonic look — that I should reach home in time for my Sunday's preaching. Later the long trial unrolled itself, in which, happily, my presence was not necessary after pleading to the indictment. Theodore Parker was the only one among the defendants who attended steadily every day, and he prepared that e