. Collier's new encyclopedia : a loose-leaf and self-revising reference work ... with 515 illustrations and ninety-six maps. ce and Bel-gium just prior to the armistice, canscarcely be overestimated. Air raids over cities during the warwere initiated by the Germans. Parisand London were the principal the raids on England by planes andZeppelins, 5,.511 persons were killed andinjured, of whom 4,750 were raids by Zeppelins numbered 51and those by bombing planes 59. Parissuffered to a lesser degree, but stillheavily. An incidental feature of oneof the Paris raids was th
. Collier's new encyclopedia : a loose-leaf and self-revising reference work ... with 515 illustrations and ninety-six maps. ce and Bel-gium just prior to the armistice, canscarcely be overestimated. Air raids over cities during the warwere initiated by the Germans. Parisand London were the principal the raids on England by planes andZeppelins, 5,.511 persons were killed andinjured, of whom 4,750 were raids by Zeppelins numbered 51and those by bombing planes 59. Parissuffered to a lesser degree, but stillheavily. An incidental feature of oneof the Paris raids was the suffocationof about three-score people who hadtaken refuge in a subway tube. AEBONAUTICS 52 AERONAUTICS The destructive power of the air raidswas steadily lessened, however, asdefensive measures were adopted andperfected. Airplane squadrons werekfept in reserve at London and Paris,ready to ascend aloft at an instants passages were constructed at variouspoints, to which the people flocked whenthe alarm was given. By these measuresof precaution the casualties were sensi-bly lessened. The Allies for a long time were un-. A ZEPPELIN DIRIGIBLE AIRSHIP notice to repel the invaders. Anti-aircraft guns of great range and ac-curacy brought down both Zeppelins andplanes. Searchlights of enormous candlepower swept the skies at night in everydirection. Sirens were stationed on thetops of buildings so that their shrill
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Keywords: ., bookcentury1900, bookdecade1920, bookpublishernewyo, bookyear1921
