Chicago : [Popular Engineering Pub. Co.] · leaf 512
eliminate the troubles Market street, the principal thorough- encountered in the past the Kenny auto- fare, as Penn would have seen it in 1890, matic electric lift was designed. filled with telephone and telegraph wires, The accompanying diagram explains and one showing it in 1908 virtually free at… … ground would have sunk gradually in the snow and ice, and have made repairs A button switch, mounted on every floor, impossible. operates a small lamp and a special lock. Acting upon the suggestion of Dr. Pressing any button brings a car to that Alessandri, chief of the Physical Observ- particular…
Electricity
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![An illustration from M. Vitrvvii viri svae professionis pertissimi De architectvra libri decem, ad Avgvstum Cæsarem accuratiss. conscripsit & nvnc primvm in Germania qva potuit diligentia excusi, atq[ue] hinc inde schematibus non iniucundis exornati (1543)](https://img.insideoutlibrary.com/img/200/ia-mvitrvviivirisva00vitr-105-29.webp)