. Rubber hand stamps and the manipulation of rubber; a practical treatise on the manufacture of India rubber hand stamps, small articles of India rubber, the hektograph, special inks, cements, and allied subjects . Flower Pot Vulcanizer on Stand. A chemical or round stemmed thermometer isarranged to go through the aperture in the up-turned bottom of the pot. This may be hung froma sup23ort or it may be secured by passing througha hole in a cork or block of wood. Its bulb should AND THE MANIPULATION OF RUBBER. 69 be near the part of the chamber to be occupied bythe mould or press. The press wit
. Rubber hand stamps and the manipulation of rubber; a practical treatise on the manufacture of India rubber hand stamps, small articles of India rubber, the hektograph, special inks, cements, and allied subjects . Flower Pot Vulcanizer on Stand. A chemical or round stemmed thermometer isarranged to go through the aperture in the up-turned bottom of the pot. This may be hung froma sup23ort or it may be secured by passing througha hole in a cork or block of wood. Its bulb should AND THE MANIPULATION OF RUBBER. 69 be near the part of the chamber to be occupied bythe mould or press. The press with the article to be cured is placedupon the inner plate. The temperature is main-tained at the proper point by regulating the heat,and all the conditions for excellent work are sup-plied. The disposition of the apparatus is shown inthe iNlKKIoft OF FLOWtH PoT VULCANIZER. Another arrangement equally simple is given inthe next cut. An iroli kettle has a layer of typemetal or lead poured an inch thick cast within itupon its bottom. A thermometer passing througha hole in the cover enters a cup of glycerine thatstands upon the bottom. This gives the tempera-ture. The object of having a thick or a double bottomis to prevent excessive radiation of heat from anyone part. The essential condition for good opera- 70 nUBBEU HAND STAMP MAKING tion is to maintain an even temperature throughoutthe chamber.
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Keywords: ., bo, bookcentury1800, bookdecade1890, bookidrubberhandstamps01sloa
