Here's the completed fettle of the stove that was in the tin I refurbished a couple of weeks ago. A few interesting points to note. 1) The riser tube is thicker and higher than later models. 2) The pan supports are "collared" with a ground flat rather than the more familiar drop-forged "kinked" shape. The differing profiles means they are not interchangeable with later versions. Due to the longer riser the pan supports are correspondingly longer as well. 3) The pressure release works with a washer on the screw rather than the more familiar needle arrangement. This arrangement will be familiar to owners of Bialaddin lamps. 4) This version has fixed "bun" feet rather than foldable legs. 5) It's not obvious from the picture, but the spirit can does not have a threaded cap, but is designed to be used with a cork stopper. The cork was missing so I punched one out from a wine bottle cork. 6) The spirit cup has a large dimple. This leaves the meths burning in just one position and is an indicator of when to close the pressure release and pump up the stove. There are various stamps around the stove. On the bottom is an "0" or "O". On the end of the pump knob is an "N". On the burner is a 23 in a triangle (too much to hope for that this is a date mark?) and on one of the other flats is an "A". When I tried to light it the first time I had a rather spectacular flare up! Once things had cooled down, close inspection revealed a hole in the burner: So a quick braze later all fixed: And here's another one ready for another 80 odd years..... Here's the tin, added to this post as requested.
Very well done Graham, a very nice rare stove and a fantastic fettle. I'm really impressed with the braze you carried out on the burner. By far better than replacing the burner. Once again, well done and great fettle.
Well done Graham, another professional looking fettle. Its a really nice looking stove. I do like the idea of the dimple in the spirit cup, like all the best ideas simple but effective. Best Regards, Alan
Very nice fettle there, B X 4, very nice. re: the dimple in the spirit cup. That might be for a 'prelighter' that attached to one of the burner tubes and carried the priming flame to the burner top. When the priming fuel had burned off from the priming cup, the flame in the 'prelighter' continued to burn and allowed you to light the stove without the use of a 2nd match. Item 374 a/b on this page. lovely flame too,
Hi Spudz, I must admit I previously thought that. However, having actually now tried it the dimple provides very much the same effect without the pre-lighter attachment. Not sure how it would work with a silent, but it was very effective with this roarer. Basically the rest of the flame from the spirit cup burnt down just leaving one flame burning from the dimple. If this was combined with a windshield (which I don't have for this particular stove) I imagine it would still be quite effective even in breezy conditions.
Having thought about the pre-lighter a bit more, I'm becoming more convinced that the dimple is not designed to be used with a pre-lighter, or at least the version that I have seen. As can be seen in this 210 Post I have recently fettled a stove with a pre-lighter. This type of pre-lighter does not obviously fit a dimple in a spirit cup as the base is too wide. The pre-lighter actually contains a wick that soaks up the meths and it is the meths in the wick burning off after the spirit cup is exhausted that provides the flame to light the stove as it is pressurised. So unless there is a different design of pre-lighter (anyone?) I'm pretty convinced it's not designed to be used with the dimple. Just one other thought though. Despite all the pictures I've ever seen (including in catalogues) showing the pre-lighter in the orientation I'm using it with the 210, if it was turned upsidedown, the thin end would fit in the dimple. However, still not sure of the value of combining the dimple with the pre-lighter as each used without the presence of the other provides a more than adequate flame for lighting the burner after the initial meths burn in the spirit cup. My suspicion would be that the dimple is the original idea, and the separate pre-lighter is an onward development of the principle as I suspect the dimple method would not be quite as robust in windy conditions. Any other views?
Hi Bom x 4, the now common stove igniter was, I believe, a Primus patent. Other manufacturers had their own ideas. If you look at early Optimus stove catalogues you will see the dimpled spirit cup often used in conjunction with a shroud tube, or shield, which directed a flame up to the level of the burner, without igniting the jet at a lower level. I think the dimpled spirit cups were probably used on all the Optimus models at that time. not just those with shroud igniters. If you think about it you don't really need an igniter with a roarer burner, they only become useful with a silent burner. Check out this earlier link: https://classiccampstoves.com/threads/7184 Best Regards, Kerophile.
Hi Bom x 4.here is a link to some photos of a Svea take on an igniter; https://classiccampstoves.com/threads/6252 It does make me think that at the time there was Patent protection operating on the now-ubiquitous Primus-type design. Best Regards, Kerophile.
Hi Kerophile, Thanks for sharing the earlier threads - that throws a lot of light on the subject. I agree with you on the shroud only really being of use for a silent burner. However, when firing up this 00 it did also provide a better than usual visible indicator of when to pressurise the stove. This could well be useful if the stove was used with a windshield that makes it difficult to check the spirit cup. Unfortunately I don't have the instructions for this stove to check if there is any reference to the dimple. We don't seem to have any really early Optimus or SVEA instructions that refer to dimples posted in the reference section either.
Hello Graham, I am interested in some more pics of the tin: would you be so kind? A similar container by Ross shows the then importer in China mentioned; how about yours? I share the idea of a dimpled cup without a particular funnel or "riser"; my 1.S fires up readily. This stove with yellow tin is a rare sight: congratulations with this fettle! Regards, Mike
Hi Mike, I published pictures of the tin in an earlier post as my contribution to the Halloween/Guy Fawkes event. The pics can be found in this thread: Halloween Shoot Mine is a normal Optimus tin, with no additional importer information etc.
Hi Bom x 4, You have carried out a really great fettle to both stove and "tin" I think your Op.00 is an interesting early model that it would be great if you could add the extra photos of the container to the Reference Gallery post. Best Regards, Kerophile.
Hi All, Thanks for the compliments. Per Kerophiles request the tin pics have been added. Just for anyone's future reference I was able to cut and paste the the coded links from the tin post in edit mode, into my first post above (in edit mode) without having to upload the pics separately into this thread.
So a quick braze later all fixed. Bom Bom - I need to ask how to braze an item of brass - when the parent metal of that item will melt along with the brass filler rod ? Unless you used lower temperature filler rod, or no filler rod ? Or was it a Silver Solder Braze ? Would that stand the heat ? I need to fix a similar hole in that part of a Primus 632 Blow torch. What equipment did you use ? Oxy/Acetylene torch ? Oxy/Propane ? Map gas torch ? Need your advice please. Cheers. Paul.
Hi @Paul Aslanides Bom Bom Bom Bom was last seen: Jan 16, 2013 have a look at this thread: 111b-ring-below-flame-spreader.43862
