Primus No.4 pre-1911 (c.1909)

Discussion in 'Primus No:4' started by igh371, Sep 12, 2018.

  1. igh371

    igh371 SotM Winner Subscriber

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    A pre-1911 Primus No.4, a date period so far unrepresented for the No.4. The nice crisp legends on most of the tank and components as well as the general condition of the tank overall suggest relatively little use. On the other hand the original burner has gone AWOL and that fitted is clearly a later replacement. The relatively short lived 'PRIMUS PATENT' pump tube cap legend, which immediately succeeded the Lindqvists Patent version, coupled with an old type pump rod suggests a date c.1909.

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    Last edited: Sep 12, 2018
  2. kerophile

    kerophile United Kingdom SotM Winner Subscriber

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    Wow! What a wonderful survivor, and now in operating condition.
    Best Regards,
    Kerophile.
     
  3. shagratork

    shagratork United Kingdom Moderator, R.I.P. Subscriber

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    Wonderful!
     
  4. Tony Press

    Tony Press Australia Subscriber

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    Excellent!!!

    Cheers

    Tony
     
  5. PabloS Colombia

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    Beautifull stove!
     
  6. igh371

    igh371 SotM Winner Subscriber

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    This stove is now equipped with a correct age-appropriate burner with fixed perforated ring with loose top plate. Luckily this burner does have its original 'PRIMUS' marked top cap, but the 110yr old cap is fragile and doesn't give the best flame:
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    So for practical use a new stainless steel top has been fabricated from a suitable engine core plug. This burns superbly:
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    As for the technicalities, a 42mm diameter cup core plug more or less fits directly, and works perfectly adequately. A 41.5mm cup, however, is even better, closer in size to the original, but requiring more machining of the inner face; although a further advantage of this is that it gives a slightly larger inner shelf which in turn makes for a more secure fit. With @Optimust's invaluable machining skills both stainless steel and brass cups were able to be tested out. The brass cup was found to result in significantly greater thermal feedback into the small No.4 burner body than the stainless steel cup. In conclusion I am happier with the stainless steel version on this small size burner as with the brass version it was too easy to get the outer skirt glowing!!!
     
  7. kerophile

    kerophile United Kingdom SotM Winner Subscriber

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    Hi @igh371 That is a lovely stove and an outstanding flame pattern. I am very fond of No.4 stoves bit I don’t have one as old as this one!
    Thanks for posting.
    Best Regards,
    Kerophile.
     
  8. Tony Press

    Tony Press Australia Subscriber

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    Excellent!

    Cheers

    Tony