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SF Auer type *OR*

SF Auer type *OR*

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Does anyone happen to have a lamp similar to this in their collection, or know of any reference that might be able to identify it? I am having some difficulty in finding out exactly what it is!

Some old English books show a line drawing of an identical lamp and label it as being an Osmium filament type, however I do not believe that. The type of cap is far too modern for that. Also it is marked SF Auer (presumably Societe Francaise), and osmium filament lamps were only ever made in Berlin and Vienna, not France.

I suspect it to be a more modern sintered tungsten or drawn wire tungsten filament lamp - but why the special mount construction?

The filament is mounted in a large diameter coil which spirals itself around the central ceramic column in 26 small segments. It appears to be all one continuous wire rather than 26 individual filaments. The supports are unusual. Heavy-gauge wires are clamped into the ceramic spine, and the ends of each support are formed into small hooks, each of which holds a short length of very fine wire of about the same diameter as the filament. The filament is attached to each of these fine support wires with a small metallic globule. It looks similar to how sintered tungsten filaments are arc-welded to their support wires - but that would be virtually impossible to weld together two such fine wires, at right angles to each other, without burning right through the filament wire. In Auer's patents on Osmium lamps he does describe a technique of mounting the filaments to the supports using an organic gum which bears the metal in solution - this would be painted onto the joint between the filament and its support and then heated, to decompose the joint to the pure osmium metal. The type of joint here looks similar to one made by that process, but I am not aware of such techniques being used before on tungsten filament lamps.

In all it is something of a mystery. If anyone can shed any light on it, I would be most grateful!

Philips_225-30PC35CS-E14.JPG IN_OS_Auer_OR_30K_115V_stem.jpg IN_WS_Auer_OR_30K_115V.jpg IN_P_Thorn_Rapid_Nigrescence_Signal_3000W.jpg

Light Information

Light Information

Manufacturer:Deutsche Gasgluhlicht Aktiengesellschaft
Model Reference:*OR*
Lamp
Lamp Type:Early metallic filament
Base:E26
Shape/Finish:S-60t
Electrical
Voltage:115V
Optical
Lumen Output:30 Hefner Candles
Color Rendering Index:100
Physical/Production
Factory Location:France or Germany?
Fabrication Date:c.1905-1920?

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Filename:IN_WS_Auer_OR_30K_115V.jpg
Album name:James / Incandescent
Keywords:Lamps
File Size:100 KB
Date added:Apr 01, 2015
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Lampje
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Feb 27, 2016 at 04:16 AM Author: Lampje
Dear James,

I think I found the solution.
This morning I read an article in that book of Antoon Devogelaere, "Van Gaslamp tot Gloeilicht", printed in 1987
He is writing about this lamp and there's a color photo inside the book with a burning filament.
This lamp has a balloon shape but is in technical way the same.

The Dutch text in the letterpress:

Metaaldraadlamp met ingewikkelde gloeidraadconstructie.
Deze lamp van de Societé Francaise AUER heeft een filament uit aaneengekitte (gesinterde) wolfram- en osmiumkorreltjes, die vooraf (in deegvorm vermengd) gespoten werden tot fijne draden.

In english: (Google translate plus my interpretation)

Metal filament lamp with complicated filament structure.
This lamp of the Societé Francaise AUER has a filament from sintered tungsten- and osmium small grains, mixed in dough form and were injected into fine threads.

There are a few paper advertisings on Ebay and here are the links: Ebay number: 271381850711 and the other I can't find so quickly.

Well if this is true, you have a very special lamp in your collection. My Congratulations.
The date Antoon gave in this article is 1910.
Lampje
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Feb 27, 2016 at 04:22 AM Author: Lampje
Forgotten to mention:
This lamp may burn Oblique and was the answer on the lamps with a glass stem.
Like the tantal lamp and the sintered tungsten lamps, and later the rest.
The stem in your lamp is made out of pipeclay.
rom1
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Nov 04, 2018 at 12:16 PM Author: rom1
a bulb of the same type of filament was on sale on ebay recently https://www.ebay.fr/itm/Ampoule-ancienne-auer-verre-souffl%C3%A9-fait-%C3%A0-la-main-rare/173561115102?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m1438.l2649

Never sell the bear's skin before one has killed the beast

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