The school printshop . mpan is called. In takingan impression for an overlay, it is better to loosenthe top sheets from the bottom bale, throw themback, and print on the bottom tympan overlay should then be carefully cut andpasted where it is needed over the impression onthe bottom sheet. Overlaying is a delicate oper-ation that requires time, but it is time well spent. The feed gauges should be placed on the topsheet of the tympan. The width of the marginsshould first be decided upon and then the exactdistances from the top and from the lower side G2 THE SCHOOL PRINTSHOP of the impr
The school printshop . mpan is called. In takingan impression for an overlay, it is better to loosenthe top sheets from the bottom bale, throw themback, and print on the bottom tympan overlay should then be carefully cut andpasted where it is needed over the impression onthe bottom sheet. Overlaying is a delicate oper-ation that requires time, but it is time well spent. The feed gauges should be placed on the topsheet of the tympan. The width of the marginsshould first be decided upon and then the exactdistances from the top and from the lower side G2 THE SCHOOL PRINTSHOP of the impression measured and marked by lines should be drawn through these points,one parallel to the lines of the print and the otherat right angles to them. The following is an easy,accurate method of drawing these lines: Placeone side of a mechanical draftsmans triangleunder the top line of the print in such a positionthat the other side of the triangle cuts the pointmarked below the lower side of the Fig. 33. The guide pins in position A, guide pins; B, tympan bales; C, press-board; D, tympan sheet;E, projecting edge of platen. Draw a line through this point, extending it longenough for as many guide pins as are , with the line just drawn as a base, draw theother line at right angles to the first line andrunning through the other point. The guide pinscan then be set on these lines in the exact positionat the first try. There is no guesswork about it.(See Fig. 33.) Spring gauge pins are the best kindto use, as they never slip out or become loose. The impression should be carefully washed fromthe tympan before one begins to feed. In feeding,
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectprinting, bookyear191
