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The Demand for a Better Parcels Post, Scientific Management on Sea and Shore and more

Hitting the Target at Seven Miles

Battle Practice in the United States Navy

The New Ship Canal and Locks of the St. Mary's River

Construction of the Longest Lock in Existence to Accommodate the Great "Soo" Traffic

By James Cooke Mills

An Experimental Proof of Inverted Retinal Images

By A. H. Patterson

A Twenty-five-cent Photographic Objective

By Gustave Michaud, Costa Rica State College

Abstracts from Current Periodicals - June 3, 1911

Phases of Science as Other Editors See Them

Curiosities of Science and Invention - June 3, 1911

The Inventor's Department - June 3, 1911

Simple Patent Law; Patent Office News; Inventions New and Interesting

The Current Supplement, Queer Mountain Shadows and more


  • Letters

    Correspondence - June 3, 1911

  • Departments

    The Heavens in June 1911

  • Recently Patented Inventions - June 3, 1911

  • Notes and Queries - June 3, 1911

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