Drying racks for fish are called fish flakes. Salted split fish, usually cod, are laid out on them to be dried in the sun. The fish needed to be covered from rain. Once dry, the fish was packaged for shipment. Dried salted cod could keep for well over a year.
These fish flakes are located in conjunction with a fish processing plant which might well be the Lane-Libby Company in Vinalhaven. But fish flakes could be anywhere. Small amounts of cod could be dried for home consumption or for resale to larger buyers and processors.