428 



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



No. 11502. 



No. 11504. 



No. 11536. 



No. 11530. 



RETORT, Iron, Skidmores, see No. 3440. 

 11484. RETORTS, Transparent Quartz, plain. 



Capacity, cc 50 100 200 



Each $15.00 20.65 38.40 



REVOLUTION COUNTERS, see Speed Counters. 

 RHEOSTATS, see Electrical Instruments. 

 11492. RINGS, Concentric, Copper, tinned inside, for water baths, with cover. 



Number of rings in set 5 6 



Outside diameter of largest ring, inches 3% 4% 5% 6% 



Per set 30 .40 .50 .60 



11494. RINGS, Concentric, Iron, with two removable rings, with heavy screw for clamping on support 

 for supporting water baths, sand baths, flasks, etc. Diameter of outside ring, 6 inches . . .40 

 11498. RINGS, Concentric, Porcelain, with cover. 



Number of rings in set 5 6 



Outside diameter of largest ring, cm 16 20.5 



Per set 1.65 2.20 



11502. RINGS, Iron, for attaching to retort stands; with % 6 inch screw. Distance from rod to center 

 of rings, 4% inches. 



Outside diameter, inches 2 567 



Inside diameter, inches l^io %%6 3% 4 ^s 5% 6 



Each 20 .21 .22 .25 .26 .35 



11504. RINGS, Iron, Extension, for fastening to retort stand by means of Clamp Holders Nos. 2914 and 

 2916. Length of rod, 7% inches. 



Outside diameter, inches 34567 



Each 12 .15 .18 .20 .25 



RINGS, Suberite, see Cork Rings No. 3296. 

 RING STANDS, see Supports. 



ROASTING DISHES, see Dishes, Roasting, No. 3864. 

 11512. ROPE, Manila, good quality, %-inch diameter. (No order taken for less than 12 ft.) .Per foot .04 



RUBBER GOODS 



RUBBER BAGS, see Gas Bags No. 6720. 



11520. RUBBER BANDS, assorted, in *4 pound boxes Per box 1.00 



RUBBER BOTTLES, see Bottles. 

 11524. RUBBER BULBS, for dropping pipettes, etc. 



Capacity, cc 5 



Each . .' 04 .05 



11526. RUBBER BULBS, large size, heavy walled, for pipettes, etc. 



Capacity, ce 25 50 



Length, inches 3% 



Diameter, inches 1 Vi 2 



Each 15 .20 



11530. RUBBER BULB, with hard rubber valves, for pressure only, with connecting tube. Capacity, 



about 50 cc 30 



RUBBER BULB EXPANDER, see No. 11630. 



6645. RUBBER BULB, of pure gum, with flexible tube for use with gas analysis apparatus. . .60 

 6832. RUBBER BULB, with double valves of hard rubber for use in sampling gas for analysis .60 



RUBBER BULBS, double, for pressure, see Blower No. 1382. 

 11536. RUBBER CAPS, flat shape, for test tubes of same diameter as caps. 



Diameter, inches - % % % 



Per dozen 1.00 1.05 1.10 1.20 



