1950s angles arm base black brown cover covered designed Designs disused dress-making electric gold heavy machine mechanical mechanised metal movable moving-parts non-functional old parts patterns perspectives rough sewing sewing-machine shiny silver solid tarnished vintage weathered wood wooden worn billies billy conserved-heat container convenient cooking-device durability durable economical efficient fuel-minimises fuel-minimizes handles heat-loss-minimised heat-loss-minimized heat-retention ice-cooler inner-pots insulated insulation keeps-flavour less-evaporation lids non-electric pan picnics portable portable-oven pot pots retained-heat retains-nutrients rice-cooker safe safer sauce-pan slow-cooker spill-proof stainless-steel strong thermal-cooker thermal-cooking thermal-insulation thermos-vacuum travel vacuum-cooker vacuum-flask water-saver zero-energy-use fire flame glow energy heater hot orange red spiral warm winter