Federal glass, like all Depression glass, was produced in a mold.
When the halves were removed from the mold, a seam was created.
One of the vertical walls of the mold was permanently fastened to the base and the other walls were attached to it by removable pins.
Designs were cut into the inside walls of all mold parts.
Undecorated bottles used as containers for a variety of liquids were blown into square molds to give them corners so they could be packed into compartments of wooden cases.
After the War of 1812, American glass manufacturers began using molds as an inexpensive way to produce glassware similar in appearance to the very costly cut glass that was imported from Waterford, Ireland.
(Note: the term "parison mold" and "blank mold" are synonymous for the first mold in the two mold machine process.): (see the Note box below point #3 for an exception) run up to the highest point of the finish and often onto the extreme top finish surface (i.e., onto the rim or lip).
On many early (very early 1900s into the 1920s) and occasional later (1930s and later) machine-made bottles the vertical body/neck and finish mold seams are discontinuous and offset from each other; click offset seams for a picture of this attribute.
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