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 use of rubber in surgery and dentistry, rubber tires, the hektograph, special inks, cements and allied subjects, also giving the sources of India rubber and its history .. . rolled into a ball and called cabezza;the dried strips pulled out of the cuts is of verygood quality and is called bola or burucha. From Brazil is exported the famous Para iudiarubber. This is of very high quality, and is greatlyesteemed by all manufacturers. No process
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 use of rubber in surgery and dentistry, rubber tires, the hektograph, special inks, cements and allied subjects, also giving the sources of India rubber and its history .. . rolled into a ball and called cabezza;the dried strips pulled out of the cuts is of verygood quality and is called bola or burucha. From Brazil is exported the famous Para iudiarubber. This is of very high quality, and is greatlyesteemed by all manufacturers. No process canmake a poor gum give a really good product. Thesystem of gathering it varies. Sometimes the treeis cut into by gashes from an axe, such gashes ex-tending in a row all around the trunk. Under eachgash a small clay cup is luted fast with some freshmixed clay. These collect from a tablespoonful ofjuice upward, which is collected, and the cups areremoved on the same day. The next day a secondrow of cuts is made below the others, and the same AND THE M. i NIP UL A TION OF R UBBEE. 21 process is repeated. This is continued until from apoint as high as a man can reach, down to theground the tree is full of cuts. Sometimes a gutterof clay is found partly around the trunk withgashes above it. In other cases a vine is secured. ?5^ Tree Tapped for India Rubber. around the tree and a collecting gutter is workedwith it for a basis. The juice is coagulated in a smoky fire. A bot-tomless jar is placed over the fire and some palmnuts are mixed with the fuel. The mould, which isoften a canoe paddle, is smeared with clay to pre-vent adhesion and is then heated. A cup of juiceis poured over it, and after the excess has droppedoff it is moved about rapidly over the smoke and 22 RUBBER HAND STAMP MAKING hot air which ascends from the mouth of the series of operations is repeated until the coat-ing is quite thick; it may be as much as five solidifying over night it is cut o
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Keywords: ., bookcentury1900, bookdecade1910, bookidrubberhandst, bookyear1912
