Pearl Light (1930s).

Discussion in 'Other Brands' started by Tony Press, Dec 9, 2019.

  1. Tony Press

    Tony Press Australia Subscriber

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    This is a Pearl Light table lamp. It consists of an Australian-made Pearl Light hollow-wire burner especially mounted on a French Lilor heater tank.

    This lamp looks like it came out of the same lamp manufacturing environment as the Australian-made Gloria table lamps that used the Gloria No. 20 hollow-wire burner. The craftwork makes me sure that this was factory produced and not a home-made job.

    The burner is that of a 1933 Australian Patent application by Joseph Swanson Doughty and Thomas William Sands (of TW Sands) shown here:

    https://classicpressurelamps.com/th...or-improved-burner-australia-no-11-427.11513/

    While it looks like a Gloria (and much of it is a copy of the Gloria No. 20 burner), it is a very interesting development of that technology. Below, I will post the parts against the Patent. I will discuss some of the features of the lamp and patent below.

    P1060304.jpeg

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    "PEARL LIGHT"
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    "PAT. No. 11427"
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    Here is the Patent drawing with burner parts as a guide to the photos below:
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    The rectangular cut out is the portal for pre-heating the lamp. The patent says that the lamp is lit with a "taper".
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    The burner casting below is very heavy nickel plated brass. The grate on the burner cap is ceramic.
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    The Pearl Light hinged hood cover is heavy cast brass, unlike the Gloria that is made of brass sheet.
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    The Coleman-like filler cap and check valve.
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    The Lilor pressure gauge was pretty corroded, but I cleaned it up. It has a plastic "glass". I have a watch glass on order.
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    The "P" is my mark on a repair I had to make to the pressure gauge.
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    As it came:
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    Up and running:

    Studio shot at 15 psi.
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    Full crank in the shed at 25 psi:
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    The Patent


    One of the features of the Patent is the inclusion of two generators. The first (top) one is filled with asbestos fibre and it feeds the second (lower) generator:

    "Briefly stated the improvements comprise the employment of two generators resulting in improved vaporization of the hydrocarbon oil ... the generator pipe 2 is provided with a suitable packing 20 to increase the heating surface and prevent boiling of the oil. It will be understood by the foregoing description of one form of the invention that when a mantle M is fitted to the burner B and the latter lit, the heat plays on both generator pipes 2 and 5 and so ensures perfect vaporization of the oil. By means of this invention the generator can be set in operation by primarily heating same with a lighted taper subsequently used for lighting the burner so that the use of methylated spirits which is dangerous is avoided"
    (from the patent).

    IMAGE 9-12-19 AT 21.15.jpeg

    The drawing above also shows the pricker needle and rod (17) that also acts as a dimmer for the light:

    "..the generator pipe adjacent the burner is provided with a needle valve for regulating the combustible vapour".

    Parts 8, 9 and 10 are simplified in my lamp (see photo above).


    TW Sands sold Pearl Light in the 1930s. The Pearl Light Co also sold this patent in hollow-wire in the 1930s and 40s. Doughty went in and out of various partnerships and periods of insolvency during this time. I understand (from a personal communication) that the company name was bought in the 1950s, but that piece of research is still in the pipeline.



    I will post a separate thread on the fettle. It wasn't too difficult, but the many parts required patience and concentration.


    Conclusion

    This is one hell of a good lamp! As far as I know, there are no other extant examples. The burners, of course, were sold as hollow-wire.



    Cheers

    Tony
     
  2. Akeepsake

    Akeepsake Subscriber

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    Very cool Tony !!
     
  3. A Hendrikx Netherlands

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    very nice lamp and design:content:
     
  4. george

    george United States Subscriber

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    Very well presented!:D/:thumbup:
     
  5. ROBBO55

    ROBBO55 Subscriber

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    Excellent post Tony and a rare piece of the Australian story.
    Not forgetting it's a beautiful lamp
    Congratulations :thumbup::thumbup::thumbup:
     
  6. AussiePete

    AussiePete Australia Subscriber

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    @Tony Press
    As always, a great fettle and a good read. I enjoyed your presentation and marvel at your fettling skills. Well done.
    Cheers
    Pete
     
  7. JEFF JOHNSON

    JEFF JOHNSON United Kingdom Subscriber

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    A very lucky find!:thumbup::clap::D/:D/:clap::thumbup:
     
  8. JohanOptimus

    JohanOptimus South Africa Subscriber

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    Thank you for taking the effort to share with us.
     
  9. phaedrus42

    phaedrus42 Subscriber

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    A very fine restoration and comprehensive presentation, Tony!
     
  10. Tony Press

    Tony Press Australia Subscriber

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    Last edited: Dec 11, 2019
  11. Tony Press

    Tony Press Australia Subscriber

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    There's an earlier mention of the Pearl Light in a TW Sands advertisement from 23 November 1933, here:

    https://classicpressurelamps.com/threads/tw-sands-including-pearl-light-1933.14999/

    The interesting thing about this particular advertisement is that it was published after the Pearl Light Patent application (February 1933); and after the Provisional Specification was accepted (March 1933); but before the Complete Specification was accepted in February 1934.

    Thank you, @Anthony.

    Cheers

    Tony
     
  12. Mackburner

    Mackburner United Kingdom Founder Member Subscriber

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    I have just finished looking at Pearl Light to list the company in the PLC. The last advert for the Pearl lighting system is 12th July 1952 so these were presumably on sale from 1933 to at least then which is a pretty good run for an old fashioned looking lamp for the period. It does however mean we can't really date any of them unless they are marked as Doughty's Pearl Light since that company name dates from 1943 when Pearl Lighting went into receivership and was re-named by the new owners Joseph Doughty and Frederick Bastian. ::Neil::
     
  13. James K

    James K Subscriber

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    A beautiful and interesting lamp.
    Well done on a good fettle and thank you for such a well documented post.
    Top job
    James
     

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