Hello guys, I found this veteran lantern, scratched 3 8 on the fount. The vaporiser has a sort of "fin" on it and I have never seen this feature on others (see pics attached). I see no typical Petromax engraving on this part either. Is that original carburetor for this model or a foreign spare part? (Argentinian probably). Can anyone tell? I unscrewed a 500 jet though I know this lantern was ranked 300 c.p originally. I'm looking forward to hearing from you
@Adolfo You can find the patent from 1953-04-13 Wim mentioned online here under this link. Just klick on "Original document" in the menu at the left (under "Bibliographic data"). Of course the document itself is in German, but you can see the drawings on the third page. This obviously means that the vaporizer was replaced at some point in time, as the lantern itself is clearly older than 1953. However, it could also be a part not original to Petromax, since the fin is soldered on outwards (and not inwards, as the patent shows). A 500 CP jet should work fine in that lantern, since the 828 and the 829 are mostly identical in their parts, except for the jet & needle of course.
I also have a Petromax Rapid 828 FANAL 6/9 The vaporizer is marked with Petromax and has no reinforcement .
In my collection I have found an 826 which also has the Fanal batch. This lantern has a vaporizer without the fin too. Unfortunately, the scratches at the tank bottom are barely visible, but I assume that they are 9 / 5. It has an old style pump locking and a fibre handwheel as seen on this lantern from Leo. However, the cap with inner chimney on mine is the later version from the mid 1930's onwards which could confirm the date on the tank bottom.
A look at my collection tells me that the vaporizers with fins were probably intended exclusively for the 500 HK Petromax lamps in both Germany and Argentina before the war.
I have seen some Preston-loop type vaporizers with their fins located on the 'outer' sides similarly to that in the pictures. Some are larger than the one shown. Some positioned slightly higher up the vaporizer tube. They were made by other manufacturers too. Can't recall the names. I'm not sure if Graetz or E&G ever made these. In the 1953 patent by Fritz Graetz, the fin is on the inner side. I think the main function is to be sort of a stiffener to reduce eventual heat-induced bending during operation. According to the patent, fins that are located on the outside might act as heat sinks and possibly reduce the overall vaporizer temperature to efficiently vaporize petroleum.
