HOW TO DRAW OBJECTS. 



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 requisition, 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 most simple form is that shown in Fig. \-i. 



Fig. 42. 



With this the microscope must be considerably 

 inclined and the camera lucida attached to the eye- 

 piece. The emergent pencil is reflected by the 



