India rubber world . made of a magnetizable metal, eithersoft steel or cast iron being the metal molds such as are usedin hard rubber work could not bemagnetized and heated, although theycould doubtless be used in a pressor vulcanizer that was itself electri-cally heated. J&. ^^ FIG. 5. Description : 5., \ulcanizer ; 53, door; 54, 55. magnet coils for closing docjr^; ^6, coil for heating the vulcanizer57, protective casing. WHILE not much has been heard recently in regard to thegrade of rubber known as Almeidina, it appears that interest in it has not died out in the country of its p
India rubber world . made of a magnetizable metal, eithersoft steel or cast iron being the metal molds such as are usedin hard rubber work could not bemagnetized and heated, although theycould doubtless be used in a pressor vulcanizer that was itself electri-cally heated. J&. ^^ FIG. 5. Description : 5., \ulcanizer ; 53, door; 54, 55. magnet coils for closing docjr^; ^6, coil for heating the vulcanizer57, protective casing. WHILE not much has been heard recently in regard to thegrade of rubber known as Almeidina, it appears that interest in it has not died out in the country of its production. The Portuguese Diariodo Governo of September 24 contains aroyal decree authorizing the govern-ment to grant to Portuguese compa-nies legally constituted, to Portuguesesubjects, or to foreigners who under-take to establish Portuguese companies,concessions for the exploitation of theAlmeidina rubber plant {EuphorbiatirucalH) in Angola, on certain condi-tions, the details of which we hope topresent 46 THE INDIA RUBBER WORLD [November i, 1904. ^ THE ASTFALCK QUICK PRESS SYSTEM. FROM Germany The India Rubber World has receiveda description of a System for hydraulic presses for vul-canizing rubber goods, known as the Astfalck system, that isinteresting. Allowing for the lack of illustrations, and for thedifficulty that the translator had in comprehending technicalterms, and eliminating descriptions of qualities that all of thebest makes of presses have in common, there still remainsmuch of value in the article, which follows : ? In order to avoid any disadvantageous sagging, thesepresses are provided with a number of plungers, are so construct-ed that no harmful warping can arise from the heating andcooling of the machine. To provide for the greatest possibleuniformity of expansion in the upper and lower parts of thepress, without detrimental action of the friction upon the deadweight, a compensating device has been added which consistsessentially of two cast iron
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