Dating atlas canning jars desktop dating network
This process, which was complicated and error-prone, became popular in the late 1830s or early 1840s and was commonly used for sealing fruit jars from the early 1850s until about 1890.
The wax sealing process was largely the only one available until other sealing methods were developed, and widely used into the early 1900s.
On January 5, 1875, Charles de Quillfeldt of New York City invented a wire-bail closure known as the Lightning closure.
The closure consists of a metal wire arrangement with a lever that applies leverage to a glass lid when pivoted downward against the side of the jar, clamping it down over a separate rubber O ring.
By far the most popular and longest used form of closure for the glass canning jar was a zinc screw-on cap, the precursor to today's screw-on lids.
It usually had a milk-glass liner, but some of the earliest lids may have had transparent glass liners.
Most metal lids used today are slightly domed to serve as a seal status indicator.
The vacuum in a properly sealed mason jar pulls the lid down to create a concave-shaped dome.