Page:Popular Science Monthly Volume 89.djvu/674

 A Great Collapsible Field- Periscope

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��A giant Gfrmyn (klil- periscope captured by the French during the earher battles on the Somme. It was constructed by Zeiss, of Jena. The iUustralion shows it elevated to a height of fifty feet, the carriage supporting the collapsible tube at that height without any props or other assistance. However, with the aid of stays and struts, the periscope can be extended to eighty-five feet, its greatest height. The insert shows the instrument packed for transporting

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