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Hangars, dirigibles, at Orly, French       493
     Doors for, French                     492
                Zepplin                    495
     General remarks on                    496
     Heating of, French                493-494
     Le Bourget, French                    492
     Lighting of, French                   493
     Night bombardment airplanes, French   407
     Stoves for, French                    494
     Zepplin                               495
Hanriot aircraft, French               329-476
                  Italian                  507
     Airplane 14 bis, French               479
                  Training, French         477
                  Types                    476
     Dual control mechanism, French        480
     Dual mechanism, French                478
     Metal construction, French            480
     Twin float training airplanes, French 479
Harpoon hook device for deck flying,
 British                                   722
"Hawk" airplanes, "Mars II",
 Gloucestershire, British                  779
Haw propellers, German                     589
Hasards, fire, British                     731
Head resistance, French                331-353
Heating, airplane, French                  495
Heating apparatus, French      391-393-401-408
     Arrangements, French                  389
     Blankets, ambulance airplanes, French 454
     Hangars, French                   493-494
     Installation, French                  406
     Passengers' cabin, commercial airplanes,
      Bristol, British                     790
Heat retaining jar, Aladdin, British       818
   Treatment, duralumin, French            483
Heavy airplanes, French                    333
   Engines, oil, British                   724
Helicoplane, Pescara, French           502-503
Helicopter, Brennan, British               723
            British                        723