Primus No.4 silent burners.

Discussion in 'Stove Forum' started by kerophile, Sep 3, 2011.

  1. kerophile

    kerophile United Kingdom SotM Winner Subscriber

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    Hi, I have been posting some photos of Primus No.4 stoves recently and have been giving some thought to the evolution of the silent burners on these stoves.

    Here are my preliminary findings:

    The Primus No.4 was introduced fairly early in the life of Primus stove manufacture, probably around the start of the 20th Century. The earliest silent burners had a deep "skirt" extending around the burner caps, and the outer "cap" had a fixed perforated screen brazed to the vaporisation chamber.

    This form of silent burner cap was replaced with the now more-familiar, removable inner and outer burner caps by the mid 1920s, although the deep skirt was retained.

    There is an example of a 1925 Primus No.4 with the fixed perforated screen outer cap on the CCS website. I have posted photos of a 1926 Primus 4 with a burner with the more modern removable inner and outer silent caps. Both these stoves have the deep skirts around the vaporisation chamber and burner caps.

    The next stage in the evolution of the silent burner used on Primus No.4 stoves seems to have taken place in 1935. The "skirt" became shallower although the rest of the burner remains as before.

    In the CCS Gallery there is a 1934 Primus no.4 with the deep skirt design, posted by mbechtel.
    I have posted images of 1935 and later No.4 stoves with shallow skirt burners.

    Here are some images to illustrate the two burner styles described above:

    On the left we have the "deep-skirt" form used up to and including 1934. On the right we have the later "shallow skirt" style used from 1936 until the end of production, probably in the late 1940s.

    1315076543-Pr.4-caps.St.159_351-1.jpg


    Below we have two more detailed photos of the pre-1934 "deep-skirt" form of No.4 burner:

    1315076578-Pr.4-caps.St.159-3.jpg

    1315076597-Pr.4-caps.St.159-4.jpg

    Finally, two photos of the "shallow-skirt" No.4 burner used from 1935 until production ceased in the late 1940s.


    1315076566-Pr.4-caps.St.351-2.jpg

    1315076608-Pr.4-caps.St.351-5.jpg

    I look forward to receiving any comments.

    Best Regards,
    Kerophile.
     
  2. mbechtel

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    Thank you for posting this George. Is the Primus No.4 the only stove with a silent burner of this size? I did notice all the No.4's you posted in the Gallery recently. What a nice addition.
     
  3. kerophile

    kerophile United Kingdom SotM Winner Subscriber

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    Hi, Checking some of the Primus Catalogues I find that the R132 burner was used on the Pr.34, 4, and 5J:or stoves. I have also seen one on a Pr.212, which was an early silent-sister to the ever-popular Pr.210.
    Best Regards,
    Kerophile.
     
  4. Arachnocampa

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    One other difference I noted is that the fixed burner ring type also did not have the punched holes in the bottom of the burner dish.

    This is from my 1925 No. 4:

    1315343070-10_burner_fixed.jpg

    Cheers
    Colin
     
    Last edited by a moderator: Jun 26, 2015
  5. kerophile

    kerophile United Kingdom SotM Winner Subscriber

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    Hi Colin, how about a photo showing the base of the bowl of the burner on your early No.4 stove?
    Best Regards,
    Kerophile
     
  6. kerophile

    kerophile United Kingdom SotM Winner Subscriber

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    Hi Colin, I found a suitable photo of your un-perforated burner base in your earlier Post:

    https://classiccampstoves.com/posts/194606

    Great observation! I have never owned such an early No.4 stove.

    Best Regards,
    Kerophile.
     
    Last edited by a moderator: Jul 1, 2015
  7. kerophile

    kerophile United Kingdom SotM Winner Subscriber

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    Hi, using @shagratork excellent spreadsheet I was able to confirm that Primus produced the No.4 until at least 1951. Optimus offered their No.4 until at least 1957/58

    Best Regards,
    Kerophile.
     
    Last edited by a moderator: Apr 16, 2018
  8. presscall

    presscall United Kingdom SotM Winner SotY Winner Subscriber

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