What do the dots on the bottom of Mason jars mean?
mold code number
The sequence of space and dots represent a mold code number and they allow electronic control of the production process and of that particular mold.
How do you identify glass bottle markings?
Identify the Type of Markings
- Embossed labels or product names often appear on the sides of bottles.
- Maker’s marks often appear on the bottom of the bottle.
- Pontil marks are circular shapes on the bottom of the bottle that indicate that the bottle is made of free-blown glass.
What do the numbers mean on the bottom of a glass bottle?
Always look very closely over the entire glass bottle or other container to see if there is a logo (emblem, trademark, initials, or just a letter) visible that might be a mark that identifies the actual glass manufacturer. Often, a trademark or other marking is embossed on the very bottom of the bottle, or along the lower “heel” of the bottle.
What are the numbers on the bottom of a Duraglas bottle?
DURAGLAS was the brand name of their container glass, introduced in 1940. This particular bottle was made at plant number 7 (Alton, Illinois). G-94 was the bottle style number. “3” is a mold number. 51 is the year date code. This is an example of a typical configuration seen on many bottles.
How to read the numbers on an eyeglass prescription?
How to Read an Eyeglass Prescription 1 Latin Abbreviations. One must first take a little lesson in Latin to make sense of an eyeglass prescription. 2 The Numbers. Eyeglass prescriptions contain numbers—lots and lots of numbers. 3 More Abbreviations.
How to determine the strength of reading glasses you need?
Adjusting the Strength of Reading Glasses for Your Working Distance. The strength of reading glasses determines how far or close you will be able to see with them. If the power is too low, you will have to hold things further away to see them clearly. If the power is too high, you will have to hold things closer than usual before it will be clear.
https://www.youtube.com/watch?v=cfyt5nTSAqU