AN EXPERIMENTAL INVESTIGATION OF MICROPRINGING BY THE OFFSET METHOD, SUPPLEMENT.
SMC EQUIPMENT MANUALS FIELD OFFICE CHAMBERSBURG PA IMPROVEMENTS BRANCH
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The original report covered the experimental work of printing lexical material and half-tones at a reduction of 5.55 to 1. The quality of the samples produced clearly indicated that the limitation of the offset method had not been reached for lexical material. However, the halftones printed at 665 and 745 lines per inch 26 and 29 lines per mm indicated that the tonal range should be reduced to prevent loss of detail in both high light and shadow areas. A supplementary test has been made primarily to check the possibility of further reduction of lexical material. As line art is legible at greater reduction than continuous tone, it was included in this test. A survey of art preparation groups showed a preference for and a trend toward more line art and fewer halftones. This preference and trend will favor microprinting by making greater reduction practical, and is another reason for including line art. A microcopy test chart was included to provide a basis for quantitative evaluation of the reductions. Author