. 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 . hot but nottoo much so. In the Post Office stamps the date requires to bechanged frequently. Some of the figures do dutyfor two or three days each month. Thus the figure8 is in the designation of three days, the eighth,eighteenth, and twenty-eighth. There are threechanges involved therefore in connection with thisday numeral. When a stamp mould or matrix is castthe place of numerals
. 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 . hot but nottoo much so. In the Post Office stamps the date requires to bechanged frequently. Some of the figures do dutyfor two or three days each month. Thus the figure8 is in the designation of three days, the eighth,eighteenth, and twenty-eighth. There are threechanges involved therefore in connection with thisday numeral. When a stamp mould or matrix is castthe place of numerals that are to be changed isfilled with a blank space in the part where the typewould otherwise come. A number is stamped u\this space when needed, by means of an ordinarysteel number-punch. When the number is to be changed the old char-acter is scraped or cut out, leaving a small irregularhollow. A very small piece of soft lead, about one- AND THE MANIPULATION OF RUBBER. 117 sixteenth of an inch on each side, is dropped intothe hollow. With a flat faced punch it is flattenedout, and on it the new number is impressed by asteel punch. This operation is repeated a greatmany times before the matrix is worn
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Keywords: ., bo, bookcentury1800, bookdecade1890, bookidrubberhandstamps01sloa
