Editing Incandescent light bulb (section)

=== Ribbon machine ===
Corning continued developing automated bulb-production machines, installing the Ribbon Machine in 1926 in its [[Wellsboro, Pennsylvania|Wellsboro]], Pennsylvania, factory.<ref>{{Cite book |title=Innovations in glass |date=1999 |publisher=Corning Museum of Glass |isbn=0872901467 |location=Corning, New York |page=[https://archive.org/details/innovationsingla0000corn/page/52 52] |oclc=42012660 |url=https://archive.org/details/innovationsingla0000corn/page/52 }}</ref> The Ribbon Machine surpassed any previous attempts to automate bulb production and was used to produce incandescent bulbs into the 21st century. The inventor, William Woods, along with his colleague at Corning Glass Works, David E. Gray, had created a machine that by 1939 was turning out 1,000 bulbs per minute.<ref name=":0" />

The Ribbon Machine works by passing a continuous ribbon of glass along a [[conveyor belt]], heated in a furnace, and then blown by precisely aligned air nozzles through holes in the conveyor belt into molds. Thus the glass bulbs or envelopes are created. A typical machine of this sort can produce anywhere from 50,000 to 120,000 bulbs per hour, depending on the size of the bulb.<ref>{{cite web |url=http://www.enotes.com/how-products-encyclopedia/light-bulb |title=Light Bulb: How Products are Made |archive-url=https://web.archive.org/web/20100914105212/http://www.enotes.com/how-products-encyclopedia/light-bulb |archive-date=14 September 2010}}</ref><ref>{{Cite news|url=https://blog.cmog.org/2018/01/09/running-the-ribbon-machine-stories-from-the-team/|title=Running the ribbon machine: Stories from the team|date=9 January 2018|work=Behind the Glass|access-date=14 May 2018|language=en-US|archive-date=8 February 2019|archive-url=https://web.archive.org/web/20190208214828/https://blog.cmog.org/2018/01/09/running-the-ribbon-machine-stories-from-the-team/|url-status=live}}</ref> By the 1970s, 15 ribbon machines installed in factories around the world produced the entire supply of incandescent bulbs.<ref name=":1">{{Cite news|url=https://blog.cmog.org/2017/01/27/the-machine-that-lit-up-the-world/|title=The machine that lit up the world|date=27 January 2017|work=Behind the Glass|access-date=14 May 2018|language=en-US|archive-date=1 January 2018|archive-url=https://web.archive.org/web/20180101140303/https://blog.cmog.org/2017/01/27/the-machine-that-lit-up-the-world/|url-status=live}}</ref> The filament and its supports are assembled on a glass stem, which is then fused to the bulb. The air is pumped out of the bulb, and the evacuation tube in the stem press is sealed by a flame. The bulb is then inserted into the lamp base, and the whole assembly tested. The 2016 closing of [[Osram Sylvania|Osram-Sylvania]]'s Wellsboro, Pennsylvania plant meant that one of the last remaining ribbon machines in the United States was shut down.<ref name=":1" />