The Preparation of Illustrations for Reports of the United States Geological Survey / With Brief Descriptions of Processes of Reproduction

by John L. Ridgway

U. S. GEOLOGICAL SURVEY

PREPARATION OF ILLUSTRATIONS PLATE VI

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HALF-TONE CUTS SHOWING EFFECT OF SEVERAL STANDARD SCREENS IN THE REPRODUCTION OF THE SAME DETAIL.

The names of certain months may in some places be abbreviated; those of others should invariably be spelled out. The following are the correct forms:

Jan.	Apr.	July	Oct.
Feb.	May	Aug.	Nov.
Mar.	June	Sept	Dec.

The abbreviations for number and numbers before figures are No. and Nos. The o should never be raised, as in N^o. The abbreviation for Mac is Mc, not M^c.