| Captive balloon |
| A balloon held captive to a point on the ground by means of a cable. |
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| Caquot balloon |
| Name given to the elongated type of captive observation balloon invented by Capt. Caquot of the French Army, now in general use in war. |
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| Cartwheel |
| A particular type of aerial manoeuvre |
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| Cell |
| The whole of the lower surface of a plane and the whole of the top surface of the plane above it, with the struts and wires holding them together |
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| Cellule |
| The rectangular box-like compartments in a biplane formed by the upper and lower planes and the interplane struts |
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| Centre of Gravity |
| Centre of mass or weight |
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| Centre of Pressure |
| A line running from wing tip to wing tip, along which all the air forces on the wing may be said to act |
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| Centre Section |
| The centre cellule of a biplane where this cellule is made detachable from the wings |
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| Chart room |
| Room used for assimilation and distribution of data from balloons and batteries. |
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| Chocks |
| Wooden, wedge-shaped blocks placed in front of the wheels of the aeroplane to prevent it from moving when the engine is started |
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