Chapter V: India Rubber Stamp Making

Mixed Sheet--Outlines of Moulding--Home-Made Vulcanizing
Press--Further Simplifications of Same--Securing Accurate
Parallelism of Platen and Bed--Distance Pieces--Wood vs.
Iron as Material for Press--Use of Springs on the Home-Made
Press--Metal Flask Clamps--Large Gas-Heated Vulcanizing
Press--Preparing Type Model--The Matrix--Plaster of Paris and
Dental Plaster as Substances for Matrices--Dextrine and Gum
Arabic Solutions for Mixing Matrix--How Matrix is made--Shellac
Solution for Matrix--Matrix Press and Spring-Chase--How to
retard the Setting of Plaster of Paris--Oxychloride of Zinc
Matrices--Talc Powder--Moulding and Curing the Stamp--Kerosene
Heating Stove--Manipulation of Press--Degree of Heat--Simple
Test of Curing--Time Required--Combined Matrix Making and
Vulcanizing Apparatus--Chamber Vulcanizers--Object of Steam
in Vulcanizers--Temperature Corresponding to Different Steam
Pressures--Jacketed Vulcanizers--Gas Regulator--Flower
Pot Vulcanizer--Fish Kettle Vulcanizer--Making Stamps
without any Apparatus Whatever--Notes on Type, Quadrats and
Spaces--Autograph Stamps 47

CHAPTER VI.

INDIA RUBBER TYPE MAKING.

Movable Type Making--Simple Flask and Matrix--Precautions
as to Quantity of Rubber--Moulding--Curing--Cutting Type
Apart--Special Steel Moulds--Wooden Bodied Type 73

CHAPTER VII.

THE MAKING OF STAMPS AND TYPE FROM VULCANIZED INDIA RUBBER.

Ready Vulcanized Gum as Material for Stamps--Simplicity
of the Process of Using It--Advantages and
Disadvantages--Availability for Type 77

CHAPTER VIII.

VARIOUS TYPE MATRICES FOR RUBBER STAMPS AND TYPES.

Electrotype Matrices--Papier Maché--Flong Paste--Flong
Matrices--Beating into Model--Drying and Baking--Struck-up
Matrices--Chalk Plates 80

CHAPTER IX.

THE MAKING OF VARIOUS SMALL ARTICLES OF INDIA RUBBER.

Suction Discs--Pencil Tips--Cane and Chair Leg
Tips--Corks--Mats--Cord and Tubes--Bulbs and Hollow Toys 85

CHAPTER X.

THE MANIPULATION OF SHEET RUBBER GOODS.

Sheet Rubber Articles--Toy Balloons--Uses of Sheet Rubber in
the Laboratory 94

CHAPTER XI.

VARIOUS VULCANIZING AND CURING PROCESSES.

Liquid Curing Baths--Sulphur Bath--Haloids and Nitric
Acid as Vulcanizers--Alkaline Sulphides--Sulphur Absorption
Process--Parke’s Process 97

CHAPTER XII.

THE SOLUTION OF INDIA RUBBER.

Mastication with Solvent--Peculiarities of
the Process--Different Solvents and their
Properties--Paraffin--Vulcanized Rubber Solution--Aqueous
Solution 103

CHAPTER XIII.

EBONITE, VULCANITE AND GUTTA-PERCHA.

Ebonite and
Vulcanite--Manufacture--Manipulation--Gutta-Percha and its
Manipulation 108

CHAPTER XIV.

GLUE OR COMPOSITION STAMPS.

Substitute for Rubber Stamps--The United States Government
Formula--Models and Moulds--Dating--Handles 113

CHAPTER XV.

THE HEKTOGRAPH.

How Made--The French Government Formula--Hektograph Sheets 121

CHAPTER XVI.

CEMENTS.

Marine Glue, and other special Cements 125

CHAPTER XVII.

INKS.

Hektograph, Stencil and Marking Inks--White and Metallic Inks 129

CHAPTER XVIII.

MISCELLANEOUS.

Preservation and Renovation of India Rubber--Burned Rubber
for Artists--India Rubber Substitutes--General Notes of
Interest 134

RUBBER HAND STAMP MAKING AND THE MANIPULATION OF RUBBER.