. How to make rubber stamps for profit. amps for Profit. the Platen, for vulcanizing. If you turn theMould Plate around occasionally, by the timeyou get the mercury in the Thermometer atthe proper point for vulcanizing, the mould willprobably be dry enough to vulcanize. HOW TO TELL WHEN THE MOULDIS DRY. To test how the mould is drying, use asmall mirror (a small pocket-glass is good).Keep it dry and away from heat when notusing it, and to try the mould, hold it, glassdown, for a few seconds over the mould. Ifthere is any moisture in the mould, it will showon the glass. Keep up a moderate heat
. How to make rubber stamps for profit. amps for Profit. the Platen, for vulcanizing. If you turn theMould Plate around occasionally, by the timeyou get the mercury in the Thermometer atthe proper point for vulcanizing, the mould willprobably be dry enough to vulcanize. HOW TO TELL WHEN THE MOULDIS DRY. To test how the mould is drying, use asmall mirror (a small pocket-glass is good).Keep it dry and away from heat when notusing it, and to try the mould, hold it, glassdown, for a few seconds over the mould. Ifthere is any moisture in the mould, it will showon the glass. Keep up a moderate heat underthe mould until no moisture is to be seen on thelooking-glass when held for a few seconds overthe mould. TO HEAT THE VULCANIZER. When the mould is dry, lift the platen(Fig. 4) on the press, allowing it to slide downover the upright posts until it rests flat on thebed of the press (Fig. 8). Turn on all the How to Make Rnbbe)- Stamps for Profit. 25 heat you can, and let press heat up until themercury in the thermometer (L) reaches a. point a little below 300 degrees, and then turnoff the heat entirely. After the heat is turned off, the mercurywill go up several degrees above 300. Whenthe mercury begins to fall, watch it until it getsto 300 degrees. VULCANIZING THE RUBBER. Have a piece of raw rubber cut to the sizeof the type impression in the mould. Also getthe mould ready while you are getting the mer-cury down to the right point. That is, hold a piece of sand-paper on ablock of wood, and smooth down any highpoints of the mould until it looks like the mould 26 Hoiv to Make Rubber Stamps for Profit. you find on the mould-plate which we sendwith press. Brush the dust out of the mouldand blow out any small particles. Sprinkle themould and the raw rubber with French chalk,and dust it out of the letters in the mould, andshake any surplus off the rubber. Have themould-plate hot just so it will not siss whenmoisture is applied to it with the fingers. Lay the raw rubber on the moul
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