Volume 104, Issue 22
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Features
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
An Experimental Proof of Inverted Retinal Images
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