PAPERS PRESENTED AT GENERAL SESSIONS 43 



A NOVEL AXD ECONOMIC METHOD OF MAKING 

 CHARTS FOR SCIENCE INSTRUCTION 



William M. Wesley, St. Procopius College, Lisle. 



Are charts of any value ! 



Many of you who are engaged in teaching the sciences, 

 but especially those in connection with botany, zoology 

 or psychology, have, no doubt, realized the importance 

 of charts in the class room. If a particular phase or 

 stage is visualized, it is impressed more forcibly upon 

 the mind of the student ; hence it is more readily retain- 

 ed in his memory. 



The market is indeed flooded with charts, but seldom 

 is a person able to procure just what he would want. 

 Hence you are confronted with this problem: Are you to 

 adopt a course of instruction to fit the charts available; 

 are you to omit the use of charts altogether, or are you 

 to make your own charts ! 



It was the last named course that was adopted at our 

 college at Lisle, for the faculty refused to be satisfied 

 with what the market had to offer. At first Dr. Jurica set 

 a few students to work at making charts free-hand, but 

 soon realized that this was tedious and quite expensive. 

 After negotiating with a number of optical companies, 

 he finally induced the Spencer Lens to modify their Model 

 3 Delineoscope so that it could be used for projecting 

 opaque frustrations at any distance. Ordinarily the 

 delineoscope is equipped with but a short plunger which 

 does not permit a short working distance. This means 

 that one would have a limit to the size of any particular 

 illustration on the chart. But an 18 inch plunger allows 

 one to come as near the cloth as is desired and corres- 

 pondingly reduces the size of the picture. 



The procedure is quite simple. Having made the 

 proper connection, and having set the delineoscope 

 in place, all one needs to do is to tack the cloth in- 

 tended for the chart to a wall or beaver board. Then 

 project the selected illustration, from a book, a re- 

 print or a drawing, regulating the size by moving the 

 table backward or forward as is necessary and focusing 

 by means of the elongated plunger. "With this all set, one 



