PAPERS PRESENTED AT GENERAL SESSIONS 45 



depending upon their complexity. It is both a time and 

 a money saver. Moreover, a simple turn of the globe 

 enables one to use the delineoscope for lantern slide 

 projections. 



The accompanying- illustrations show some of the stu- 

 dents at work making charts. 



Turning the globe back again and inserting a sliding 

 feeder, postal cards may be projected. 



