and Laboratory Methods. 



1993 



A Rack for Exhibiting Charts. 



While many lecture rooms are fitted with racks for exhibiting charts, it very 

 frequently happens that considerable difficulty is experienced in satisfactorially 

 arranging the charts, especially if they are of different sizes and kinds. The 



Typhoid Death Rate5 in Zurich, c)Witz. 



BEFORE AND SINCE INTRODUCTION OF 5AND FILTERS 

 (DEATH RATE I'ER 100,000 POPULATION.) 



Fig. 1. 



rack about to be described has been in use for a year and has been found 

 thoroughly reliable. 



The rack is made of any convenient size and consists of a wooden frame and 

 horizontal brass rods, such as are used for hanging lace curtains. These rods 

 may run through the wooden uprights, or preferably, be fastened in front 



