A Microphone
EMPLOYED FOR DETECTING THE SOUND OF APPROACHING AIRCRAFT AEROTHERAPEUTICS thus produced among his troops. Earlier than this, the Italian poet-aviator d'Annunzio had flown over the Alps to Vienna and circled over that city, us, though the titles of 72 others are ÆSIR tragic poet. Of 90 plays produced by him, 40 were rewarded with the public prize, but only seven have come down to A TWENTY-PASSENGER CAPRONI TRIPLANE dropping pamphlets which told the Viennese that he could just as easily have dropped bombs and urged them to withdraw from a hopeless conflict.