. 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 . corked formulae are given in chapter XVII. The writing is executed with an ordinary steelpen. The lines should be rather heavy so as to showa greenish color by reflected light. The surface of the pad is slightly moistened witha wet sponge and is allowed to become nearly paper is then laid upon it and smoothed is best done by placing a second sheet over
. 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 . corked formulae are given in chapter XVII. The writing is executed with an ordinary steelpen. The lines should be rather heavy so as to showa greenish color by reflected light. The surface of the pad is slightly moistened witha wet sponge and is allowed to become nearly paper is then laid upon it and smoothed is best done by placing a second sheet over itand rubbing this with the hand. No air bubblesmust remain between the copy and the tablet, andthe paper must not be shifted. It is allowed to remain for a minute or lessand is then raised by one corner and strippedfrom the gelatine surface. It will have left thereversed copy of its inscription perfectly reproducedupon the tablet. At once a piece of ordinary writing paper of thedesired size and quality is laid upon the tablet. ANB THE MANIPULATION OF BUBBER. 123 smoothed down, and stripped off, when it will befound to have taken witli it a complete copy ofthe inscription or writing. This is repeated over. The Hektograph. and over again with another sheet of paper, untilthe ink on the pad is exhausted. Fifty or moregood copies can be thus obtained. As soon as the work is completed the remains ofthe ink should be washed off with a moist sponge 124 RUBBER HAND STAMP MAKING. and the tablet, after drying a little, will be ready fora second operation. Some practice is required to ascertain the properstrength of the writing and degree of wetness of thesurface. When the gelatine surface becomes im-paired it can be remelted in a water bath if it is nottoo dark from absorption of ink. French Ministerij of Public Worh Formula.—Glue,100 parts, glycerine 500 parts, finally powderedkaolin or barium sulphate 25 parts, water 375 a little hydrochloric acid in the water forwashing
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