Popular science monthly . i - A giant Gfrmyn (klil-periscope captured by the French during the earherbattles on the Somme. It was constructed by Zeiss, of Jena. The iUustralionshows it elevated to a height of fifty feet, the carriage supporting the collapsibletube at that height without any props or other assistance. However, withthe 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 CGO Watching a Battle Through a Super-Periscope

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Keywords: ., bookcentury1800, bookdecade1870, booksubjectscience, bookyear1872