Inside Out Library · ExploreHeat-transfer Tests of a Steel Cylinder Barrel with Aluminum Fins (1939)NASA Technical Reports Server (NTRS) · leaf 22Figure 7. - Cylinder cross section after polishing and etching surface. i*062NASA Technical Reports Server (NTRS)Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.More pictures from Heat-transfer Tests of a Steel Cylinder Barrel with Aluminum FinsMore like this
