that marks the junction of the baffle plate

on a machine-made bottle. This line is found on the completed bottle in the form of a (usually off-center) circle occupying most of the base and may extend onto the heel. Like a suction-scar

, the baffle mark

on two opposite sides (Schulz et al. 2016).

on machine-made bottle bases that somewhat resembles an Owens Automatic Bottle Machine

A bottle/glass maker term for a relatively narrow, horizontal ring on the neck of a bottle (Illinois Glass Co. 1906, 1920, 1926).  It appears that this feature was purely decorative in nature.  A ball neck is illustrated to the right on a 1875 to 1885 hair dye bottle which is described on the Household (non-food) Typology page

This is probably a collector term of unknown origin which refers to a bottle making flaw of a thread or bridge of glass on the inside of a bottle (always a mouth-blown bottle to the authors knowledge) running from one side to another.  This is a function of the hot glass sticking to itself during the parison

) actually formed a thin membrane or shelf of glass that adhered to three sides of the bottle - the two wide sides and one narrow side.  Sometime after the glass cooled and hardened, much of the thin membrane broke (the right side of the flaw) leaving a relatively thick strand still remaining which bridges between the two wider bottle sides.  In th [..]

", "lower part", or ring