Tensile Strength of Welded Steel Tubes : First Series of Experiments (1928)
NASA Technical Reports Server (NTRS) · leaf 22
N.A.C.A. Technical Memorandum No.445 Figs.4,5,11. dp Fig.4 Device for welding tubes of like diameter. … Fig.5 Mounting for tensile test Annealed through welded laps Not annealed Annealed by- butt welding Wl^^^Pi Fig.11 Annealed zone of a weld.
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-777-525.webp)
![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten10unit-421-296.webp)