Structures of Thin Sheet Metal, Their Design and Construction (1928)
NASA Technical Reports Server (NTRS) · leaf 23
—2JSLr Figs. N.A.C.A. Technical Memorandum No.490 1,2,3,4,5,6,7,8 & 16 a~4a Folds (in web) a i i !i| Fig.3 Fig.3 Vertical strips or stiffeners Lower flange Fig.l Sheet metal girder. i, a-Aa iff?tf MM f f ( M Mlft "1 6, ^ 4 a(l+f) la1 ^-v i r a p Fig.4 Fig.6 Fig.5 … Fi£«? Fig.8 Fig.16
NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten10unit-763-515.webp)
