. 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 . , but its natureand properties are now those of vulcanized is unaffected by heat or cold within ordinaryranges of temperature, and if the india rubber is ofgood quality and made by a proper formula it willlast for years. The first thing to be described is the mould,which includes the arrangements for pressing thesheet of india rubber while heated. A small pressis needed fo
. 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 . , but its natureand properties are now those of vulcanized is unaffected by heat or cold within ordinaryranges of temperature, and if the india rubber is ofgood quality and made by a proper formula it willlast for years. The first thing to be described is the mould,which includes the arrangements for pressing thesheet of india rubber while heated. A small pressis needed for this purpose. It may be of the sim-plest description, and as an example of a home-made but perfectly efficient one the illustrationmay be referred to. The base of the press is a pieceof iron, if heat is to be directly employed. Where a AND THE MANIPULATION OF RUBBEB. 49 chamber vulcanizer is used both base and platenmay be of wood. But from every point of view ironis the best. It lasts forever, admits of direct heat-ing, and does not split, warp, or char. Throughtwo holes drilled near its opposite sides two or-dinary bolts are thrust. It is best to use flatheaded bolts, and to countersink a recess for the. Simple Vulcanizing Press for RrBBER Stamps. heads in order to keep the bottom level. Tlie beadsmay need to be filed off so as to reduce their thick-ness, in order to secure this object. The bolts maybe soldered in place. One thing should be care- 50 RUBBER HAND STAMP MAKING fully watched for—the holts should be set true so asto rise vertically from the plane of the base. The platen is best made of iron, cut of the shapeshown. This is an excellent disposition of thescrew-bolt slots, as by swinging the right end of theplaten back it can be taken off without removingthe nuts and lifting it over the ends of the the two nuts fitting the thread of the screwsit is well to have half a dozen extra ones larger thanthe others,, which will slip easily over the bolts, s
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Keywords: ., bo, bookcentury1800, bookdecade1890, bookidrubberhandstamps01sloa
