Talk:Edison screw
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E26 . Mion 00:32, 2 March 2007 (UTC)
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[edit] Female Half
This article unfortunately discusses only the Male-half of the E-xx connector. The Female-half also deserves discussion, since it frequently is the source of the major hazards associated with this rather crude and outdated system of connectors.
The hazards arise from thermal ratcheting and from the thermal disintegration of the raw paper frequently used as insulation in the receptacle.
Has anyone figures on how many electrocutions per year occur attributable to insulation failure in these devices ?
[edit] E26 / E27
Are these really two separate sizes, or two names for one standard size? And, although metric is now the international standard, these sizes originated in a non-metric culture, and it is surely no accident that this most common bulb base in the US actually measure one inch -- that article should mention this!-69.87.202.161 14:44, 13 May 2007 (UTC)
It seems like both E26 and E27 are actually one-inch diameter, and the E27 is longer, with a more pointy tip contact. So, E27 is a particularly bad example to use in the intro; I'll change it.-69.87.201.38 13:58, 5 June 2007 (UTC)
[edit] more details
"Most domestic and industrial light bulbs have standard fittings compatible with standard lampholders. The most common types of fitting are:
- E12 or candelabra
- MES or medium Edison screw (aka E26), used in the USA and Japan for most 120 and 100 volt lamps
- BC or double-contact bayonet cap, used in the UK, Ireland and Australia for most 240 volt mains lamps (although MES is also common in the UK)
- E14 / E27 screw fittings, used in continental Europe. (E27 is very similar to MES, but not identical.)
In each designation, the E stands for Edison, who created the screw-base lamp, and the number is screw cap diameter in millimetres. (This is true even in the United States, where other designations involving the diameter of the bulb itself are still given in eighths of an inch.) In North America, there are four standard sizes of screw-in sockets used for line-voltage lamps: candelabra (E12), intermediate (E17), medium or standard (E26), and mogul (E39). In continental Europe, these are instead slightly different: candelabra (E10 or E11), intermediate (E14), medium or standard (E27), and mogul (E40). There is also a rare "admedium" size (E29), and a very miniature size (E5), generally used only for low voltage applications such as with a battery. Bayonet bulbs have similar sizes, and are given a B designation.
Halogen bulbs often come inside one of these standard bulbs, but also come with pin bases. These are given a G designation, with the number being the centre-to-centre distance in millimetres.
General Electric introduced standard fitting sizes for tungsten incandescent lamps under the Mazda trademark in 1909. This standard was soon adopted across the United States, and the Mazda name was used by many manufacturers under license through 1945." [1] -69.87.201.38 13:58, 5 June 2007 (UTC)
[edit] Actual role of Thomas Edison
I thought that Thomas Edison cut his light bulb research practically back to zero after the formation of General Electric, so did he have any role personally or via his lab in the development of this? And his bulbs had screw threads way before 1909. How did the 1909 version differ from earlier ones? See Lewis Latimer's 1890 book, (which was actually written years before) page 31, which says the lamps had a screw thread.[2]. Page 73 of this 1884 book [3] shows a screw thread which looks different from the one used 1909 to present. I have what I believe to be a pre-Mazda carbon filament bulb with the tip from evacuation which fits in a modern socket. An ad from 1910 for Mazda lamps [4] says "Screw them into any socket just like the ordinary incandescents" indocating that the arrangement was not novel to the 1910 Mazda lamp.Edison (talk) 05:41, 2 March 2008 (UTC)
- " Forty Years of Edison Service, 1882-1922: Outlining the Growth and ... - Page 80 by Thomas Commerford Martin [5] says on page80 that the squirted filament was developed in 1894. "Edisonia," a Brief History of the Early Edison Electric Lighting System" by Committee on St. Louis exposition shows what looks like modern Edison lamp base threads on page 108 and says on that the changing of the screw thread took place with the change to squirted filament. I have seen no discussion of a change in lamp sockets being necessary when the carbon filament or metalized carbon Gem filament was replaced by the Mazda filamen starting 1909-1910, so I think the modern Edison screw thread can be dated to 1894, not 1909 as this article states. Edison (talk) 07:00, 2 March 2008 (UTC)
