140 



LIQUEFACTION OF GASES. 



TABLE II. 



SUBSTANCES WHICH ARE GASEOUS AT ORDINARY TEMPERATURES AND 

 PRESSURES, BUT CONDENSED BY COLD ABOVE 0° C. 



NAME. 



FORMULA. 



TBMP. 



Butane 



C 4 H 10 

 C 4 H 8 

 C10 2 

 CH 3 H., N 

 (CH 3 ) 2 HN 



1° 



Butylene 



Chlorine peroxide. . . . 



Methylamine 



Dimethylamine 



3° 

 9° 



8° or 9° 



TABLE III. 



SUBSTANCES GASEOUS AT ORDINARY TEMPERATURES AND PRESSURES, 

 TEMPERATURE AND PRESSURE FOR LIQUEFACTION NOT STATED. 



Allylene 



Carbonyl sulphide. . . 

 Hydrie selenide. . . . 



Methyl fluoride 



Phosphorus fluoride. 

 Silicon hydride 



FORMULA. 



C. ( H 4 

 COS 

 Ho Se 

 CH 3 F 

 PF 5 

 Si EL 



Total number of gases, 



47. 



SIMPLE DEVICES FOR LOCKING LABORATORY DRAW- 

 ERS AND CUPBOARDS. 



BY LEROY C. COOLEY, PH.D. 



A strong small staple is fixed in the framework be- 

 tween the adjacent corners of four drawers. A disk of 

 heavy sheet brass is provided with a rectangular slit at 

 the centre, only large enough to receive the staple. A 

 small padlock is then applied. The disk projects over 

 the corners of the drawers and effectually fastens them. 

 Those in use are only four and a half inches in diameter ; 

 the padlock is one and a-half inches across. 



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