Proportioning scales such as those shown in figure 2 

 may also be used in calculating reductions or enlargements 

 of illustrations. 



Be sure to tell the draftsman the size you want the 

 original line drawing and the reduction you anticipate from 

 that size, so he will know the appropriate size of letters 

 and lines required to produce a legible figure. Figure 3, 

 too, will aid you in deciding on the size of lettering needed 

 for the reduction your line drawing requires. 



^^»tt«UGt UUuij,^^^ 



,| I I M I I I I 



,|,„|,|,|,,,| 





hhi|l.iilihl|iJiii|Hj|||lii|||iili|||uJ{iiiii|liiili|iliiiliiiliiilili: 



Figure 2.— Proportioning scales may be obtained at art-supply stores. 

 (Courtesy U.S. Bureau of Mines.) 



