THIS is an ARBITRARY-25 light bulb blow mold originally made for the Corning Glass works Sylvania OSRAM ribbon machine, one of the fastest machines in the world. This is one of the largest I have. It is medium sized, probably 6 lbs... An E27 I am certain.
THIS IS A BLOW MOLD FOR TEARDROP ( arbitrary ) LIGHT BULB, with a long neck, bulb. It has a cast, long, neck, compared to others, and is a large typical teardrop shape. A bout 7.25"high. See pics for scale representation. I can take more pics and more measurements if anyone likes.
......originally used on the factory floor. very rare, and yes, you could blow glass in it if you would like. I present the pieces as novelty pieces, and they clean up beautifully with a little WD-40 and a rag... I clean every pair with evaporust, and wash it down good afterwards, what you see is only flash rust on the surface. Look online for examples of buffed, and shined, molds on display in museums.
You get two halves. The fit together, and make a mold, for the glass ribbon machine to fill, blow, and release. There are old movies on YT showing us the machine in operations. It also made Christmas ornaments, and bottles, and many other glass blown vessels in the production runs.
There is no reason you cannot blow glass in it today: however, I present it as a display piece for nostalgia. how the light bulb was made ( by the millions every day). ~1600 per min: Ran all day.
This machine put a light bulb in just about every home in the world for about 80 years. This is, one, of its many, cast iron split molds.
The molds were lined with cork, wetted, and a ribbon of hot glass laid upon the running chain... : A
huge chain of these molds ran at a ridiculous rate, and laid a ribbon
of hot glass, across the top, blew the bulb, turned the mold, split the
mold, and spit the bulb out off the end of the chain... All in a
fraction of a second. Rumor
has it, that once a season, they would tear down the light bulb line,
in a day, install the X-mas molds, make ALL the world Christmas
ornaments, in a single day. Then tear back down for light bulbs the
following day. You may never see them anywhere else. Good luck trying to find them elsewhere. I have looked and I have never seen one for sale, in years.Thankyou for the consideration, and the appreciation of the art, this machine created.
I will be listing a few other rare ones too: other shapes and styles. Consumer bulb profiles. X-mas bulbs. Truck lights. Test tubes. Etc. All made on the Ribbon machine. If you want to buy more than one.
( Quote form the YT vid:)
One of the world's fastest machines in action.
After Thomas Edison developed a practical and durable light bulb filament in 1879, it took time for this technology to take hold, in part because it required a new product: glass envelopes to surround the filament. When Edison first commissioned Corning Glass to manufacture those envelopes in the early 1880s, skilled glassblowers could produce just two bulbs per minute.
To meet the growing demand, the ribbon machine was conceived by William J. Woods in 1921, and designed in collaboration with his Corning Glass colleague, David E. Gray. By moving a ribbon of glass across a sequence of orifice plates and molds, into which air is blown to form the light bulb envelope, the machine produces a constant stream of bulbs. By 1926, the Corning Ribbon Machine could produce up to 300 light bulbs per minute, hour after hour, day after day. Continued innovation led, in 1998, to a ribbon machine able to produce over 1,600 bulbs per minute.
YT link of the machine in action. You can see the split molds come up,
on their molding wheel, and grab the ribbon of hot glass: form the bulb,
cool and splits, throws out its new created bulb; all in a matter of
seconds.. as the production line rolls on.
YOUTUBE LINK ( select, right click, and select ' open link in new tab " to watch)
The
SYLVANIA OSRAM Ribbon machine made 90% of the worlds light bulbs,
within a total of some 15 machines in use, producing upwards of 2
million light bulbs a day, each.1600 per min. Production using the
ribbon machines, tapered near the end of the 70s, but still made bulbs
through the 90's... the early 2000's, when modern production made them
obsolete, and the need for such design considerations as plastic cases,
plastic molding, semiconductor LED, and other fragile elements in modern
electronic light bulbs.
AI generated descriptions: This
vintage Sylvania glass ribbon machine lightbulb is a unique addition to
any collection. The cast iron Corning GE mold is a rare find for
industrial mold collectors, and the ribbon machine itself is a testament
to the quality and durability of Slyvania products.
With its sleek design and intricate details, this machine is sure to be a
conversation starter in any room. Whether you're a fan of antiques or
just looking for a unique piece to add to your collection, this Slyvania
glass ribbon machine lightbulb is a must-have.
THE SHARPIE< AND RULERS< ARE NOT INCLUDED< ONLY IN THE PIC FOR SCALE REPRESENTATIONS>
Yes, I combine all shipping on multiple purchases, charge only ACTUAL
shipping, and refund any $$ that was overpaid by the buyer for the (
estimated) shipping. You dont have to do a thing: I refund after sale
any extra $$ paid for shipping more than one ( 1) item.
Thank you all for the attention these pieces of history deserve.