CENTRAL SCIENTIFIC CO., CHICAGO, U. 8. A. 275 



No. 6544. No. 6556. 



0042. GAS, Oxygen, for oxyhydrogen or lime light, in steel cylinders tested to 600 pounds pressure 

 per square inch. The capacity is figured at standard pressure of 225 pounds to the square 

 inch. Complete with MacLachlan Patent Double Needle Valve, and with name plate en- 

 graved 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 $21.85 24.35 26.25 



6543. CYLINDERS for Nos. 6540 and 6542 (returnable for refilling only), refilled with oxygen or 

 hydrogen per cubic foot .13 



G.~44. PRESSURE GAGE, indispensable to users of oxyhydrogen, for measuring the amount of gas 

 in a tank. Indicates both cubic feet and pounds pressure 6.00 



6546. GAS, Nitrogen, compressed, in cylinders. 



No A B C 



Capacity, cubic feet 25 50 100 



Price of gas 3.75 5.00 6.25 



6547. CYLINDERS for No. 6546 (returnable for credit in good condition less a rental charge of 25 



cents per week after 30 days.) 



Xo A B C 



Capacity, en. ft 25 50 100 



Each 18.00 26.00 42.00 



6550. GAS, Nitrous Oxide, liquefied, in cylinders of 100 gallons of gas price of gas 3.50 



6551. CYLINDER for No. 6550 (returnable for credit in good condition, less rental charge of 25 



cents per week after 30 days) 6.00 



6554. GAS, Oxygen, pure, in steel cylinders, under pressure of 1800 pounds per square inch. 



No A B 



Capacity, gallons of gas 40 100 



Size of cylinder about, inches 3%xl4 4%x24 



Price of gas 2.00 5.00 



6555. CYLINDERS for No. 6554 (returnable for credit in good condition less a rental charge of 25 



cents per week after 30 days), complete with wheel valve and yoke to permit attachment 

 of rubber tubing. 



No A B 



Each 7.50 13.50 



6556. REGULATOR. Constant Pressure, for oxygen tanks, for maintaining a uniform pressure of gas 



up to 200 pounds per square inch, when delivered from high pressure cylinders. With two 

 gages, one showing the pressure in the tank, the other the pressure delivered 35.00 



6557. ADAPTER for use with No. 6556, when used on small oxygen tanks 4.00 



6558. REGULATOR, Constant Pressure, same as No. 6556, but with the smaller gage reading to 30 



pounds of pressure delivered, instead of 200 35.00 



6560. GAS, Sulphur Dioxide, in cast iron cylinders with valve, holding about 10 pounds, complete 6.00 



6561. CYLINDER for No. 6560 (returnable for refilling only), refilled with sulphur dioxide. . . 3.00 

 GAS ABSORPTION TUBES, see Absorption Tubes; Ammonia Absorption Apparatus. 



