: This is blue glass Mason canning jar with a flip top. Mason jars were named for their inventor, John L. Mason of New York, and were manufactured by many different companies. The imprint on this jar reads, "Mason's/ Patent/ Nov 30th/ 1858." During World War II, conserving garden produce for later consumption became a vital activity to support the war effort. Canning and drying food was essential to increasing the food supply on the home front, for troops abroad, and for hungry citizens of Allied nations. The canning process prevented fruits and vegetables from spoiling. By removing oxygen from jars holding produce, undesirable bacteria would not be able to grow. Good vacuums created in canning jars formed tight seals that keep liquid in and air out. View on Ohio Memory.
: Om3330_4692218_003 Subjects
: Daily Life; Agriculture; Canning and preserving; Glassware Places