i88 



DRAWINGS FOR PUBLICATION 



[CH. VI 



of every writer the possibility of appealing to the eye by means of 

 pictures and diagrams illustrating the facts which are presented in 

 the text. Artistic ability is of course indispensable for a perfect 

 representation, but any one willing to give the time and the pains 



Substage 

 Condenser 



FIG. 114. THE MICROSCOPE ARRANGED FOR DRAWING ON A HORIZONTAL 



SURFACE. 



(From Optic Projection). 



The microscope is of the handle type (H) with the fine adjustment (/ a) on the 

 side below the coarse adjustment (c a). 



The ocular is of the Huygenian form with the real image at (r i). 



Prism, the right-angled prism beyond the ocular to reflect the light directly 

 downward. 



can make simple drawings, especially if one or more of the helps 

 above described are available. 



The various helps for making drawings described in this chapter 

 will be found useful to the born artist as well as to the person who 

 has not great artistic ability, for by means of the optical and mechani- 

 cal helps the outlines and proportions can be secured with fidelity by 

 any one. Then the born artist can use the time saved for making 

 the pictures more artistic, and the plodder can feel confident that 

 his efforts are correct even if not pretty. 



Young authors are urged to get the Style Brief furnished by the 

 Wistar Institute of Philadelphia. This is a guide for the preparation 



