| Bank, To |
| To raise one wing for the purpose of turning |
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| Barograph |
| A registering barometer. |
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| Barometer |
| An instrument measuring both altitude and atmospheric pressure; it may be mercurial or aneroid. |
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| Barrage balloon |
| A small spherical captive balloon raised as a protection against aeroplanes. |
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| Basket |
| The car suspended beneath a spherical or observation balloon for passengers, ballast, instruments, etc. |
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| Batons |
| Light pieces of wood used for stiffening the nose or other parts of dirigible or captive balloons. |
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| Bay |
| The space enclosed by two struts and their upper and lower adjoining surfaces |
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| Belt |
| The safety strap which secures the pilot to his seat |
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| Bessoneau |
| A tent for storing aeroplanes which can be erected and dismantled in a few days |
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| Bias |
| Cloth or fabric, cut obliquely from the direction of the threads. |
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