enty-eight In 1899 the Illinois Telegraph and Telephone Com- seven shafts, had iron doors imbedded in concrete, and miles already have been constructed, and extensions are pany began to build a series of tunnels under the streets were long enough to accommodate the work, in some projected. of… … CHICAGO'S FREIGHT, EXPRESS, AND MAIL SUBWAYS, This network of tunnels is now utilized for a quite dif- The work was carried on by miners working in three centers in Chicago, and operates to and from a busi- ferent purpose than that for which it was originally shifts of eight hours each, the nature…
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![An illustration from XIXe [i.e. Dix-neuvième] siècle (en France); classes - moeurs - usages - costumes - inventions. Ouvrage illustré d'un front. chromotypographique, de 16 planches coloriées aux patrons, de 36 entetes et lettres ornées et de 487 gravures (dont 24 tirées hors texte) d'après les principaux artistes du siècle (1893)](https://img.insideoutlibrary.com/img/200/ia-xixeiedixneuvi00granuoft-802-610.webp)
