HOW TO DRAW OBJECTS. 



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To be able to make a correct drawing of the 

 enlarged image of an object is very important and 

 while for some lines of work the photographic camera 

 is called into use, drawings are nevertheless largely 

 relied upon. The apparatus requisite for this purpose 

 is the camera lucida and while there is a variety of 

 forms, all are based upon the principle of causing the 

 image of the object to appear projected upon the 

 paper, where it may be drawn. 



The image of the object, the paper and the pencil 

 point are viewed at the same time and, with proper 

 regulation of light, are equally distinct. The micro- 

 scope image seems to be projected 

 upon the paper and it is only neces- 

 sary to draw the outlines and fill out 

 details to obtain an exact picture of it. 



The most simple form is that 

 shown in Fig. 55. With this the p . 55 



microscope must be inclined to a 

 horizontal position or nearly so and the camera lucida 

 attached to the eyepiece. The pencil of light from the 



