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REDUCTION SHEET USED IN LETTERING ILLUSTRATIONS.
The largest size shows the letters unreduced; the other sizes show the letters reduced as indicated in the margin.
Type is used also for printing lettering directly on a drawing exactly in proper position, by a special type holder, somewhat like a self-inking stamp.
Most of the styles and sizes of type now used on maps in the Survey's reports are shown in [Plate V].
If a drawing is to be reduced one-half the smallest type used should be about 2 millimeters in height; if it is to be reduced one-third the smallest type used should be about 1.5 millimeters in height; and so on. No letter whose vertical height after reproduction would be less than about 1 millimeter should be used, and the larger lettering should bear a proper relation to the smaller. Sheets showing the styles of type in use by the Survey, in full size and reduced one-fourth, one-third, two-fifths, one-half, three-fifths, two-thirds, and three-fourths, will be furnished on request. If a drawing is to be reduced one-half, for example, the sheet that has been reduced one-half will show the size of the lettering on the printed plate, so that the draftsman, by referring to the sheet showing the reduction he desires, can select type of a size that will be legible. [Plate V] shows a part of this reduction sheet.
ABBREVIATIONS.
The following are the correct forms for abbreviations used on maps and other illustrations:
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