This preserving jar was used in the first half of the 20th century to preserve cooked food - pickles. Preserving home produce in bottles is a method that applies heat to food in a closed glass home canning jar to stop the natural spoilage that would otherwise take place. It removes air from the jar to create a seal. he bottling process forms an air tight seal between the bottle and the lid. Residents of Orbost have long been self sufficient growing their own fruit and vegetables with earlier market gardeners They preserved their produce for use all year. Fowlers Vacola preserving kits were common in most kitchens.A brown glass Fowler's Vacola preserving jar filled with pickles. It is a No. 27 bottle with a size 3 metal clip. It has an 850ml capacity. The lid has metal tension clips which are secured during the canning process and are removed once a vacuum seal has formed. The lid is tin-plated with a lacquer coating, double-coated on the underside.On lid Fowlers Vacola Size 3 Top of jar- embossed with the words Fowlers Vacola food-preservation fowlers-vacola container-glass