[Frank]’s solution is an overhead trolley to support the hoses more or less vertically over the router while letting the duct swivel as the gantry moves around the work surface. There were a few ...

This article was originally published with the title “ Sea-Weed for War, Clearing the Way for the Trolley ” in Scientific American Magazine Vol. 119 No. 12 (September 1918), p. 231 doi:10.1038 ...