6. The clear presence of a circular valve mark-on the base of a container (normally a broad throat container or container) is sure proof of machine-produced create by the a hit-and-strike servers.
seven . Machine-made container generally have partners or no bubbles on the glass therefore the density of your glass is commonly a whole lot more uniform in the container versus mouth area-blown container. This is particularly true from later on machine made bottle, i.age. on the late 1920s into the. (Note: New visibility otherwise lack of bubbles regarding mug and you will relatively even delivery of one’s cup on attribute is not a great number one function of possibly host-made otherwise lips-blown bottles, however, there are solid manner.
It must be noted this one quite early force-and-strike semi-automatic server was designed to establish
(For much more factual statements about producing server-generated container go to the machine-generated container part of the Glassmaking & Glassmakers web page.)
What these Diagnostic Features Indicate: Bottles with all the noted primary machine-made characteristics (#1, #3-#5) including the suction scar on the base (point #5 above and picture to the left) can date no earlier than 1905 and are usually post-1910. Czytaj dalej This is talked about after that as Question #fourteen less than