. 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 . re generally little cylindersof india rubber, which fit into a tube that slidesover the end of the pencil. They can be thus sim-ply made. A hole is bored in a piece of wood thediameter of and a little more than the depth ofthe pencil tip. A short cylinder that exactly fitsthe hole is required for plunger. The gum is putinto the hole in little discs, or rolled up into acylinder, the
. 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 . re generally little cylindersof india rubber, which fit into a tube that slidesover the end of the pencil. They can be thus sim-ply made. A hole is bored in a piece of wood thediameter of and a little more than the depth ofthe pencil tip. A short cylinder that exactly fitsthe hole is required for plunger. The gum is putinto the hole in little discs, or rolled up into acylinder, the plunger is placed on top, and themould put in the press. It is shaped by pressureand cured as described. Sometimes the tips are cup shaped. For thesethe mould is made in two sections fastened bycatches or by pins set in the plaster as shown in thecut. The hole is made larger at bottom than at 90 RUBBER HAND STAMP MAKING top, and at the top is a little smaller than the shaftof the pencil. A plunger that nearly fits the smallend is provided. The India rubber is placed in themould and heated. When soft, the plunger isforced down to the proper distance in the pressand the article is cured. Care must be taken to. Mould for Pencil Iips. give the plunger a good coating of talc, and it mustbe made to sit vertically. The arrangement of acylindrical hole shown in the cut secures this resultperfectly. As distance piece a pin is passed throughthe plunger. Cane and Chair Leg Tips, etc.—By carrying outthe process just described with larger moulds and ofslightly different section very convenient tips forchair legs and walking canes can be made. Suchtips can be modified in size and thickness to answeras covers for the mouths of bottles, test-tubes, etc. Corks.—These mav be made in moulds tapering AND THE MANIPULATION OF RUBBER. 01 from top to bottom. The India rubber must bepacked in with great care to secure as solid filling aspossible. A pliniger is used that enters the largerend and is
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Keywords: ., bo, bookcentury1800, bookdecade1890, bookidrubberhandstamps01sloa
