[Jewelry making - Article 00305] - [Orchid] Littledale's 'granulation' patent

[Dr Jack Ogden]

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    Thought Orchid members might like to hear that we've just added the
    full text of Littledale's 1934 hard soldering patent to the JPM
    on-line library. 

    IMPROVEMENTS IN HARD SOLDERING MIXTURES AND HARD SOLDERING PROCESSES 

    Now freely available in .pdf format at
    http://www.jpm-international.com/pdf/littledale.pdf 

    This is a transcript of the full text of Henry Littledale's famous
    1934 UK Patent for new soldering processes that include a method of
    producing fine joints in gold and silver that many consider may be
    identical to that used in antiquity for the production of some
    granulation work. As will be seen, the Patent covers a far wider
    range of potential soldering mixtures than just the copper salts
    usually referred to. It is noteworthy that Littledale also mentions
    soldering silver, platinum and base metals. His use of antimony
    trioxide to solder in silver is interesting as is his use of a zinc
    hydrate soldering mixture. Could this latter be compared with
    Pliny's reference to using 'cadmea' (usually considered to be a zinc
    compound) for soldering copper alloys? 

Jack
Dr Jack Ogden
International Jewellery & Precious Metal Network
email: info AT jpm-international.com
web: http://www.jpm-international.com


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