Chart 1 The Basics of Dating Bottles Readers first need to develop the vocabulary necessary to distinguish early and late forms of bottles.
The following charts and pictures on the dating bottles pages listed below should help.
Hundreds of specific historic bottles are used as examples within the pages of this website to illustrate the concepts discussed; with luck you may find the specific bottle you have an interest in discussed though typically you will not.
This page provides some examples of how to use the website (primarily the Bottle Dating pages) to determine the approximate date or date range for various types of bottles made between the early 1800s and the mid-20th century.
Because the bottom is hotter, it is also more fluid and has a tendency to sag, forming a shape like a spinning top which makes it unstable on flat surfaces.
Giving a bottle an arched shape at the bottom means that if it does sag, it can do so without touching the bottom.
Even then the bottles discussed in depth are so primarily to illustrate the presented information and concepts.
This site instead attempts to help the user determine some key facts - approximate age & function - about any given utilitarian* bottle/jar based on observable physical characteristics.
Since there were hundreds of thousands of uniquely different bottles produced in the United States (and Canada**) between the late 18th century and the 1950s (Fike 1987), it is beyond the scope or even possibility of this site (or website or book) to provide specific details about more than just a tiny fraction of a percent of that variety of bottles.To a lesser degree, the base can sometimes provide other information about a bottle like its intended function.The Bureau of Land Management (BLM), an agency within the U. Department of the Interior, administers 261 million surface acres of America's public lands, located primarily in 12 Western States (including Alaska).The bottles used for illustration are a small but diverse assortment designed to give users guidance on how to work a bottle through the dating information to answer the Homepage's primary question #1 - What is the age of the bottle?) to the specific dating questions on the Bottle Dating page are included so that a user can reference the necessary portions of that page.