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Balloons, observation, Italian                   509
Batteries, storage, French                   377-378
Bayerische Motor Works, German                   660 
Beam, sound reflector, British                   734
Bearings for Condor engines, British             754
Beds for dirigibles, Italian                     539
Belt, gunners' method of fastening, French       366
Berline transport airplanes, Spad, French        434 
Berne deck flying, Hanriot, French               477
Bevel reduction gears, British                   853
Biggin Hill, England                             734
Bimotored airplanes, French                      333
Biplace pursuit airplanes, French                316
Biplace pursuit and nigh reconnaissance airplanes, French                                           389 
Armament for                                     390 
Characteristics of                               391 
equipment for                                    390 
Fuel for                                         390 
Biplane wings, French                            330
Blackburn Company, British                       716
Blaisdell petro flex tubing, British         731-871 
Blankets, heating of, ambulance planes, French   454 
Bleriot commercial airplanes, French             427 
Bleriot Spad Herbemong Company, French           423
Types, French                                    423
B. M. W. motors, Dutch                           679 
German                                       639-654
Conclusion, German                           666-667
Difference of make, German                       659
Failures of, German                              662
Report on, German                            658-667
Service results, German                      660-666
Type, German                                     659
Boat bottoms, concave, Italian                   543
Boats, flying, large, British                    719
Savoia, Italian                                  542
"Bodensee", ex-German Zeppelin                   630
Bolton and Paul, British                 710-712-621