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Features

Electrification of a Chicago Railway Terminal

A Warning

The Origin of European Peoples

The Army Ordnance Report

Report of the Naval Bureau of Ordnance

Engineering

Electricity

Science

A Machine for Simultaneously Firing Many Blasts

By Frank C. Perkins

A New Theory of the Screw Propeller

Photographing a Star Spectrum

By S. A. Mitchell

A Pollen-Gathering Patent Dedicated to the Public

The Phases of Venus

By Frederic R. Honey

An Aerial Passenger Railway

By Roland Ashford Phillips

How Your Eyeglasses are Made

By C. H. Claudy

Flight with Flapping Wings

The Baby Musk Ox and the Alaskan Bear of the New York Zoological Gardens

By Walter L. Beasley

Departments

  • Departments

    Correspondence

  • Recently Patented Inventions

  • New Books, Etc.

  • Notes and Queries

  • Index of Inventions

  • Patents

  • Index

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December 25, 1909

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