Im-pres′sion.
（Printing.) The pressure applied to a sheet in the press. Also the appearance of the sheet, front or back, when it is taken from the press. Making ready is to prepare press and form for printing. When some lines or letters in a form have been worn longer than the other type, a piece of paper is pasted on the bottom of these lines to raise them to the proper height. This is called an underlay. When type or stereotype plates give a faint impression in spots, a piece of tissue paper of the size and shape of the spot is pasted upon the tympan. This is called an overlay. When the whole sheet has a gray or light appearance, the impression is regulated by turning up the impression screws of the press. Too much impression on a sheet raises the paper so that the letters show in relief on the back of the sheet.
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| Imposing. |
