en done, pencil a distin-guishing mark on the strut and on thelongeron, so that it will be picked out againand put into the same place in the samefuselage. Preferably use a rubber stamp. All struts will be fitted in this manner,and after this work is completed, eachlongeron should have the position… … 61 HOW AN AEROPLANE IS BUILTmachine with the aid of a metal plate jigclamped to the longeron to prevent theholes from being drilled out of centre. Asno inaccuracies in bolt-holes in wood workare permissible, extra care must be takenwith the drilling, and wood drills used,twist drills not being…
Airplanes
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![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten07unit-147-116.webp)
