CYANAMID — MANUFACTURE, CHEMISTRY AND USES IO3 



copper water-bath provided with a tight fitting top or lid, 

 a thermometer and inlet and outlet tubes to admit air. The 

 sample was placed in the wire gauze cylinder, and the ther- 

 mometer inserted so that its bulb was within the sample near 

 its center. The temperature of the bath was maintained at 

 100° C. for 4 weeks. For the first 6 hours of the test, tem- 

 perature readings were taken every half hour. Afterwards, 

 readings were taken twice daily until the test was concluded. 

 "The thermometer showed that the internal temperature of 

 the sample remained at approximately ioo° C. during the 

 tests." 



''Test with Water. — About lo pounds of the product were 

 placed in a wooden cylinder, approximately lo inches in height, 

 and lo inches internal diameter, the walls of the cylinder 

 being about i inch in thickness. The temperature of the 

 sample was allowed to become the same as that of the room, 

 and then about 4 pounds of water, the temperature of which 

 was observed, were added with stirring. The mixture was 

 then allowed to stand and its temperature observed for a 

 period of about a week. 



Test started at 10.30 A. M. Degrees C. 



Temperature of room during test, about 18 



" " water at start 18 



*• " test sample of product at start 17 



" '* mixture at 11.00 A. M., about 20 



"No material rise in the temperature of the mixture was 

 observed." 



"Acid Tests. — One pound samples of the product were 

 treated with concentrated hydrochloric, sulphuric, and nitric 

 acids and the results observed. 



"The acids reacted readily with the samples with consid- 

 erable evolution of Ifeat, compounds of these acids and lime 

 being produced, and the Cyanamid (CaCNg) was also attacked 

 and decomposed. No combustion or explosive action took 

 place." 

 8 



