My Dad taught how to make a "keep net" essentially a longish fairly narrow net with metal spacers fixed to a short handle; used for angling where the fish had to be thrown back. A bit like the one shown in your illustrations. Also how to make a fishing float from a wing feather (swan or similar sized bird). Not sure if these were in use during the period covered by this forum. I'm afraid to say that I caught more hedgerows than fish, enthusiasm outdid skill!