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EXPERIMENTAL PHARMACOLOGY 



in diameter is needed in abundance. Larger sizes up to 1 or 2 inches 

 are especially required if lathe work is done. The 1/S, 3/16, and 1/4 

 inch sizes are used most (these are the least expensive). The price now 

 averages about 50 cents per pound. Square brass rod can be bought 

 approximately the same as the. round (3/16 and 1/4 inch most used). 

 Hexagon rods and sawed rods are also available. Sheet brass is made 

 in thicknesses varying from about that of a very thin sheet of paper up 



Fig. 371. Blast lamp. (Buffalo Dental Mfg. Co., IHiffalo. X. V.) 



to 1/2 inch or more. It is often available only in rolls one foot in width 

 but larger firms have rolls varying in size from perhaps 1/2 or 1 inch up 

 to 12 inches. Sheet brass is of the greatest use in the laboratory not 

 only for repairing or making regular student apparatus but especially 

 for experimental work and research. The most used thicknesses are 

 approximately 1/64, 1/32, 3/64 and 1/16 inch. A small supply of 1/8 

 and 1/4 inch (and even 3/8 and 1/2) brass plate is also exceedingly 

 desirable. Spring brass wire (Xos. 14, 16, 18) should also be in stock. 



