Appleton's annual cyclopedia and register of important events: embracing political, military, an ecclesiastical affairs; public documents; biography, statistics, commerce, finance, literature, science, agriculture, and mechanical industry . slightliftings due to the repetition of this manoeuvreon each of the cables finally effected a generallifting of four inches. When it was desired tolower the arch, the operation was just the con-trary, that is to say, the wedges were removedin succession. After the two halves of the arch had beenbrought so close together that there was roomonly for the inse

Appleton's annual cyclopedia and register of important events: embracing political, military, an ecclesiastical affairs; public documents; biography, statistics, commerce, finance, literature, science, agriculture, and mechanical industry . slightliftings due to the repetition of this manoeuvreon each of the cables finally effected a generallifting of four inches. When it was desired tolower the arch, the operation was just the con-trary, that is to say, the wedges were removedin succession. After the two halves of the arch had beenbrought so close together that there was roomonly for the inse Stock Photo
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The Reading Room / Alamy Stock Photo

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2AXHA1R

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7.1 MB (399.2 KB Compressed download)

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1611 x 1551 px | 27.3 x 26.3 cm | 10.7 x 10.3 inches | 150dpi

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Appleton's annual cyclopedia and register of important events: embracing political, military, an ecclesiastical affairs; public documents; biography, statistics, commerce, finance, literature, science, agriculture, and mechanical industry . slightliftings due to the repetition of this manoeuvreon each of the cables finally effected a generallifting of four inches. When it was desired tolower the arch, the operation was just the con-trary, that is to say, the wedges were removedin succession. After the two halves of the arch had beenbrought so close together that there was roomonly for the insertion of the center-piece, theprocess of keying was begun. As the twohalves had, during the mounting, been held alittle above their final position, there was a fewinches more space between them than wasnecessary for the insertion of the key, and itwas only necessary to remove progressively afew wedges to bring the parts into contact.This operation was effected with such pre- cision that the key of the extrados was drivenhome with a few blows of the hammer, a won-derful instance of accurate calculation, consid-ering the enormous size of the parts. In April, before the viaduct was opened fortravel, two tests were made, one with a sta-. Fig. 12.—Handhole Distribution, Broadway, nearExchange Place. Showing trench, manhole, handholes, distributing duct, and service-pipe. tionary load of 4Q5 tons, and the same loadmoving. The deflection in the first instancewas 0*27 inch, and in the second 046 inch. Snhways for Electric Wires.—The multiplicationof overhead electric wires in the streets is SO

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