274 



CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A. 



No. 651 4A. 



No. 6530. 



No. 6540. 



6514. GAGES, Wire, American standard, of best tempered steel. 



No A B 



Sizes to 36 5 to 36 



Each $3.00 2.50 



GALVANOMETERS, see Electrical Instruments. 



GASES COMPRESSED IN CYLINDERS 



6524. GAS, Ammonia, liquefied, in cylinders of 50 pounds per pound .50 



6525. CYLINDER for No. 6524 extra (returnable for refilling only) 20.00 



6528. GAS, Carbonic Acid, liquefied, in cylinders of 20 pounds, per pound 25 



6529. CYLINDER for No. 6528 (returnable for credit, less a rental charge of 1 cent per day after 



60 days) 30.00 



Note: If desired, name plate with name of institution will be attached without extra charge. 

 In this case, the cylinder is returnable for refilling only. 



6530. REGULATOR, Constant Pressure, for carbon dioxide tanks, for delivering carbon dioxide at 



any desired pressure from 5 to 300 pounds. Complete with regulator and gage reading to 

 300 pounds in 5-pound divisions 15.00 



6532. GAS, Chlorine, liquefied, in cylinders of about 100 pounds per pound .25 



6533. CYLINDER for No. 6532 (returnable for credit in good condition, less a rental charge of 50 



cents per month after 90 days) 25.00 



6536. GAS, Hydrogen, pure, compressed in steel cylinders. 



No. A B 



Capacity, cubic feet 25 50 



Price of gas 2.50 5.00 



6537. CYLINDERS for No. 6536 (returnable for credit in good condition, less a rental charge of 25 



cents per week after 30 days). 



No A B 



Each 30.00 40.00 



6540. GAS, Hydrogen (Illuminating Gas), for oxyhydrogen or lime light, in steel cylinders tested to 

 600 pounds pressure per square inch. The capacity is figured at a standard pressure of 225 

 pounds to the square inch. Complete with MacLachlan Patent Double Needle Valve, and 

 with name plate engraved with name and address of institution. 



No A B C 



Capacity, cubic feet 25 35 40 



Dimensions of cylinder, inches 10x34 12x36 12x42 



Per cylinder filled with gas 18.75 20.00 21.25 



