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Maximum Load Due to Crowding

Radium on Metals

Novelties in Fire Alarms

Our Heritage of the Mechanical Arts

By Alex. Del Mar

Maximum Load Due to a Crowd of People

Disappearing Coast-Defense Guns

The Vesuvius of America

By Day Allen Willey

A Leadless Sounding Apparatus

By Alfred Gradenwitz

Realism in Military Maneuvers

By W. G. Fitz-Gerald

The Concrete Amphitheater at Berkeley, Cal

By Enos Brown

An Electric Street Sprinkler

Improved Belt-Stud Tool

Improved Shell-Digger

Oddities in Inventions

Patent Department

Business and Personal Wants


  • Departments

    Correspondence - April 22, 1905

  • Recently Patented Inventions - April 22, 1905

  • Notes and Queries - April 22, 1905

  • Index of Inventions - April 22, 1905

  • Patents - April 22, 1905

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