The Four-Track Stone Arch Bridge of the Pennsylvania Railroad across the Susquehanna River

Some Data on the Cost of Operating Automobiles for Commercial Purposes

Electricity as a Motive Power for Automobiles

A Powerful Gasoline Locomotive

By the English Correspondent of the Scientific American

Russian Railroads Report

Contemporary Electrical Science

Hydraulic Spring-Testing Machine

Purification of Potable Water by means of Ozone

Mining Ore in the Mesabi District

Production of Camphene Free from Chlorine

The De Brouwer Mechanical Stoker

Electrolytic Iron

A Forgotten National Highway: Pennsylvania's First Mountain Railroad

Sofka and Blue Dumplings—A National Indian Dish

Ginseng: Its Character, History, Commerce, and Medicinal Value

A Résumé of some Recent Studies of Radio-Activity

Electrical Notes

Trade Notes and Recipes

Trade Suggestions from United States Consuls

Patents!

Engineering Notes