The general rule when dating glass with the O-I symbol is the number to the left of the symbol is the plant code, and to the right of the symbol lies the date code. Our first example to the right Exhibit D , fortunately for me, is extremely easy to determine the date of production. One of the furnaces uses about six hundred thousand cubic feet of gas a day, and the tremendous heat produced by the burning of this much gas burns a furnace out in about twelve months. While in most cases Madison Historical received permission to publish archive items from the institution or individual who possessed the item, it has not determined their copyright status. Find others in Picture 2. With this hub, I am going to focus on the methods used by the Owens-Illinois O-I Company, and show you how to date your glass finds using the symbols and numbers indicative of the O-I company. In conjunction with the relative dates of the symbol, we know that the 9 could either stand for 1939 or 1949 1959 is possible, but very unlikely.
Please contact the possessing institution or individual for additional information regarding copyright status. Early in the school year 1936-37 a plan was made to develop a series of pamphlets or monographs on various phases of local life through which the community can be accurately interpreted to the children in the schools, Committees were appointed to begin at once the preparation of these pamphlets. The company states that tests have shown that glass blocks four inches thick made in this way protect a building from temperature --15-- changes outside as much as thirteen inches of solid brick or twenty inches of concrete. This is done by applying heat from the natural gas flame to the dry mixture inside huge clay block furnaces for a long period of time. A plan to revamp the old factory as a warehouse and building a commercial strip hoped to create 1,000 jobs. The relation between the improvement of lighting and the development of glass has been intimate. Glass Insulator In making the insulators, the molten glass comes from the furnace at white hot heat and is run into molds located on a revolving machine.
As an industry it is closely associated with the manufacturing of earthen wares. The four widemouth jars are made of clear glass and have metal lids with metal bands. This is important because it is a well known fact that a vacuum does not permit changes of temperature nearly as rapidly as does the atmosphere. When this bubble cooled and hardened, it became the first bottle ever made of glass. Also, Pepsi and Cola were known for not exactly following the Owens-Illinois companies rules and standards when it came to dating and stamping their glass bottles.
The natural gas used now comes by a long line of pipes from oil fields in Texas and Oklahoma and it costs at the rate of about six thousand dollars per month to keep a furnace operating. At the present time 1939 it takes about 400 men to do all the work necessary when one furnace is in operation. When cooled the blocks must pass several careful inspections at the hands of men trained to find flaws either in materials or in the way they were made. The history is a little confusing, and as is usual of the internet, varies from website to website, with each website having their own sources, and their own account of what happened. For a complete history of the Illinois Glass Company consult the following reference; a pdf copy of this article is included on this website: Lockhart, Bill, Bill Lindsey, David Whitten, and Carol Serr. Resources became limited as many industries focused on manufacturing supplies to support the war effort.
Ball's egg carrier patents, the relocation of the glass company to Muncie, Indiana, various products and subsidiaries, and the company's move into the field of aerospace engineering. The demand for this product has been so widespread that inside of three years it was shipped into every state in the union and into several foreign countries. In 1888, this company moved to Muncie. After this coating dries, the blocks are packed for shipment in corrugated paper boxes, each block being protected by corrugated paper separators. This leads me to believe that the 7 stands for 1957.
By the mid-40's most plants switched to using a two number date code such as 46 for a production year of 1946. That 7 placed there could literally mean anything. As glass came to be used more and more, people realized its tremendous possibilities. If you have defective vision and need help to see to read, your eyes are probably behind glass, and almost everything you see is seen through a thin layer of this substance which was first discovered such a long time ago, but which is still amazing us with its usefulness and. In Exhibit C, you can just barely make out the I in the photo, so it might be the first part of the symbol to fade.
I will never know exactly what year the previous glass was manufactured, but while digging I discovered that I owned pieces, that with a lot of persistence, could be dated to a specific year. In 1888, the Hemingray Glass Company of Covington, Kentucky, built a second factory in Muncie in order to take advantage of the abundance of natural gas. The insulator has a dome top, a single petticoat, two wire ridges, two side wire grooves and round drip points on the base. The symbol, seen in the pictures below labeled Exhibit B and Exhibit C, contains an I inside an oval with an elongated diamond superimposed over it. Simply this: In 1933, during the depression, the Hemingray Company was purchased by the Owens-Illinois Company Picture 4. Glass blocks were made at the Muncie factory until March 1966 and insulators were made until 1967.
It is frostier and more scratched and appears to have been in the water longer than Exhibit D. . Construction started in 1998 with cleanup of the old spaces and making them adhere to Illinois Environmental Protection Agency policy. Shortly after the Owens-Illinois Glass Co. After so long a time, early man found whenever a certain kind of sand was heated enough it always melted into a thick glue-like mass which could be molded into many different shapes, and which became hard, brittle and transparent when it cooled. The top part of the insulator has a flattened dome. Many of their fathers worked in the plant before them, when glass manufacturing was largely skilled hand work.
The number in that picture could either be a 6 for the plant code, meaning it was made in Charleston, West Virginia, a plant that was in operation from 1930 - 1963 Society for Historical Archaeology or it could be a year code of 9. The magic and mystery of glass is shrouded in the myths of the past. Currently the company is the largest manufacturer of glass containers in North America, South America, Asia-Pacific, and Europe, with 79 plants in 21 countries. Associated Records The collection primarily documents the history of Ball Corporation and contains related materials about the Ball family. While the company was best known for making the insulators needed for telegraph, telephone and electric power lines, Hemingray also made a variety of other products, including water bottles, lamps, toothpick holders and glass blocks. Wages and Hours The Company has always had the reputation of paying its employees as high wages in all brackets of the industry as any glass manufacturing plant. Click on the thumbnail pictures to view a reasonably good quality enlargement of each two page scan jpeg files.
The Hemingray Glass Company was organized in Cincinnati, --7-- Ohio, in the year 1848. However, without having more of the glass, I am unable to narrow that down to a specific year. If you are using electric lights, the light falls on this paper only after passing through at least one layer of glass, and very likely two. It is said that at this time enough gas could be bought to run a glass smelting furnace for a year for about six hundred dollars. That narrows down the date from 1957 to 1977 if the 7 is indeed a year code. Now, I know from the use of the symbol on the glass that both pieces pre-date the mid-1950s, but is there a way to narrow that down? The benefits of the new contract included wage increases, pension plan improvements, health and welfare coverage, and vacation and contract provisions. One Style of Insulux Glass Block.