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Recent Posts

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1
Antique Bulb Discussion / Re: Mazda bulb socket size
« Last post by adam2 on August 12, 2019, 04:43:32 pm »
These are almost certainly a standard larger screw base, internationally known as E40. Also called GES in the UK or Mogul screw base in the USA.
Less used than in years gone by but still available on fleabay and elsewhere if using the above search terms.

These sound like series street lighting bulbs.  Each lamp runs at a very low voltage but large numbers are burnt in series from a constant current high voltage supply.
Very little used these days.
2
I am occasionally making custom and special lamps of various kinds in my small glassblowing and vacuum lab.  The difficulty in making an SiC lamp is the attachment of this to a metallic wire to carry the current to this or into the lamp.  However I have a few ideas of how it might be done.  It seems that SiC fibres can now be procured from various laboratories, but I have no idea if any of them would really be suitable for a lamp filament.  However if you may know more about this or a suitable source, then for sure I would be interested to have a go at processing these into finished lamps!
3
Antique Bulb Discussion / Re: Can you identify this bulb?
« Last post by James on July 28, 2019, 02:37:03 pm »
These look like carbon filament barretters - also known as resistance lamps.  They were not intended for illumination, but as a particularly stable kind of electrical ballast resistor.  The number printed on the glass often refers to the electrical resistance value in ohms.
4
Antique Bulb Discussion / Re: Japanese flower bulbs - antique?
« Last post by James on July 28, 2019, 02:34:38 pm »
These are known as Kokka lamps, made by the Kokka-Hana Denkyu company in Japan.  Often they contain two separate filaments, which will light up individually depending on how far you screw the lamp into its socket (the end contact has a leaf-spring terminal which bends when screwed deeper into the lampholder, and makes contact to the second filament).  If you Google Kokka lamp, you will find further details on these.
5
Antique Bulb Discussion / Re: Can anyone tell me about these bulbs?
« Last post by James on July 28, 2019, 02:31:41 pm »
Dear Sova,
I recognise the lamp on the left hand side in your photo - this is a Gilmore Lamp.  It is quite distinctive because of its internal metal reflector inside the bulb, and its purpose was to shine a greater proportion of its light downwards when suspended from the ceiling.  I do not have much more detail about this lamp, but it is a carbon filament type and I suspect that it was probably made around 1900-1910.  Since it has a quite unique design there is probably a patent on it which would allow more precise identification of its age and the manufacturer.  I already have one but I am sure it would be of interest to other lamp collectors.
The other lamp is a relatively modern tungsten filament type of little value, probably made in the late 1910s or early 1920s.

6
Antique Bulb Discussion / Re: Conductive paper in light bulb ?
« Last post by James on July 28, 2019, 02:22:59 pm »
Hi Franco,

That is a very peculiar lamp you have found, and I think probably dates to the early 1890s when GE was taking action against smaller competing manufacturers who were infringing the Edison patents.  This period sparked a lot of ingenuity in terms of trying to circumvent the patents, and one such idea was the invention of the so-called Pollard Lamp, of which you have an example.

The Edison patents refer to hermetically sealing a metal wire through the glass to carry the electric current into the bulb.  Pollard developed a technique of coating the inside of the inner glass stem tube with silver metal powder, and then pinch-sealing this around an inner metal wire to carry the current to the filament.  Hence it brings the current into the bulb without any metal wires being sealed through the glass.

I don't know whether or not the Pollard lamp stood up in the courts and was able to escape the litigation, but by 1894 the key Edison patent had in any case expired, and manufacturers who had survived that long then quickly reverted to making lamps according to the standard design, which was certainly cheaper and easier than the complex construction like yours.

I also have a Pollard lamp, further details you can find here.
7
Antique Bulb Discussion / Edison Mazda, National Mazda & GE Mazda markings
« Last post by James on July 28, 2019, 02:10:11 pm »
Recently I came across an example of an early inside frosted lamp with the Edison Mazda brand, and since the internal date markings are not visible I would like to try to determine its date of manufacture.  Since it is inside frosted, it must be later than 1925 when that type of lamp was first introduced.  I thought that it may be possible to identify the last possible date by knowing when GE stopped using the Edison Mazda brand, but realise that I don't actually know when that happened - perhaps some other members may have details about this?
nn
Surprisingly there is rather a lot of information in old lighting books and journals about GE's takeover of National Mazda and the requirement to re-name that as the National Lamp Works of GE, but I have also not been able to find a precise date of when National Mazda was dropped and replaced by GE Mazda.

By looking at old advertisements, I have not found any National Mazda references after 1931, but Edison Mazda appears to have been in use as late as 1935.  Meanwhile there are GE-Mazda branded advertisements appearing from 1930 onwards.

If anyone might be able to more precisely identify these dates, it may be of great assistance to help us identify the likely production dates of older lamps.
8
Antique Bulb Discussion / Mazda bulb socket size
« Last post by conaboy6 on July 16, 2019, 12:39:07 pm »
Hi! hopefully someone can help me with this quest:
I have 2 GE Mazda 600L 6.6A bulbs. I think they were probably manufactured between 1935 - 1945. They are large clear bulbs, 7" tall with a larger socket than regular bulbs. I am looking for antique porcelain sockets to display them in.
Thank You!
9
Christmas Lighting / Re: Strange tiny bulb
« Last post by mr.light on June 25, 2019, 01:00:34 pm »
I have a small bag of these but have never used them before so not sure what voltage they are or if they even work. I would say i have atleast 25 of them.
10
Christmas Lighting / Re: new shooting star bubble tubes
« Last post by mr.light on June 20, 2019, 10:12:12 am »
So i have received 2000 bubble lights in last week and i contacted the manufacturer and asked if they can sell me just the bulb and they said yes. Just to get an idea, how many people would be interested in replacement bubble light bulbs so i can get an idea of cost. Is 5w or 7w more of interest?
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