CH X] ERECT IMAGES IN DRAWINGS 



1O CENTIMETER RULE 



The upper edge is in millimeters, the lower in centimeters 



FIG. 211. CORRECT IMAGE. 

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H3X3JMIXN3O Ot 



FIG. 212. INVERTED IMAGE. 



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FIG. 213. MIRROR IMAGE. 

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FIG. 214. INVERTED MIRROR IMAGE. 



FIG. 211-214. FIGURES OF A METRIC RULE, FULL SIZE, TO SHOW CORRECT, 

 INVERTED, MIRROR AND INVERTED MIRROR IMAGES. 



These representations of screen images show the result of placing the object 

 in different positions or of using different means in projection. The determin- 

 ing factors for the position of the object for a correct screen image are: 



(1) Projection by an objective or by an objective and an amplifier (fig. 121, 

 126). 



(2) Projection by means of two lenses or of an objective and an ocular 

 (fig. 207, 208). 



