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Dr. Cook and the North Pole

The Elimination of Grade Crossings

Economic Loss of Overcrowding

The Transatlantic Record




Counting Our People by Machine

By M. Hamilton Talbot

How Sudd Chokes the Nile River

By Day Allen Willey

The Recent Curious Eclipse of the Sun

The Seven Bridges of Königsberg and Other Puzzles

By J. F. Springer

Termination of the Rheims Aviation Meeting

A Novel Cantilever Grain Elevator

Dr. Cook's Discovery of the North Pole


  • Departments


  • Index of Inventions

  • Patents

  • New Books, Etc.

  • Notes and Queries

  • Recently Patented Inventions

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September 11, 1909

Science for the Modern World