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



443 



Nos. 12152-3. 



1J].")L'. SIEVE SHAKER, Ro-Tap, Electrically Driven. This machine reproduces the circular and tapping 

 motions of hand sieving, with a uniform mechanical action, which produces reliable results and 

 standardizes laboratory methods. Ruggedly constructed with heavy base and substantial sup- 

 porting columns. Running parts operate in oil. By means of No. 12153 Stop-Rite Time Switch, 

 the process may be made entirely automatic, as the switch may be set for any desired time 

 interval, and the test will be automatically stopped at the end of that time. Capacity of the 

 machine, 6 standard height 8 inch sieves with bottom pan, or 13 half standard height sieves 

 with bottom pan. Complete with direct connected 110 volt motor, but without sieves or Stop- 

 Kite Time Switch. No A B CD 



A.C. D.C 



For volts . .. 110 220 110 220 



Each $200.00 205.00 200.00 200.00 



12153. STOP-RITE TIME SWITCH, for use with No. 12152 Ro-Tap Sieve Shaker. May be set for any 

 desired interval and will automatically stop machine at the end of the pre-determined period 



20.00 



12158. SIFTER, Lightning No. 0, for hand power. Complete with one sieve of any mesh up to 50 9.00 



In ordering, kindly state mesh of sieve desired. 



12166. SILICA RODS, Opaque Fused Silica, for use in stirring fusions and high temperature mixtures. 

 In lengths up to 5 feet. 



Diameter, mm 1-2 3 4-5 6-7 8 9-10 



Per foot 50 .63 .94 1.25 1.56 1.75 



SILICA TUBING, Opaque Fused Silica, glazed at the ends and smooth inside. Sizes up to % 



inch have satin finish. Very resistant to sudden changes of temperature. For combustion 



work, the glazed Combustion Tubing No. 3186 glazed inside and outside and gas tight should 



be selected. In lengths up to 8 feet. 



In ordering specify diameter and thickness of wall. 



12168. 

 12169. 



12174. 

 12180. 



Diameter, inside, mm.. 3 4-5 6-7 8 9-10 12-13 15-16 19 22 



Thickness of wall, mm. .5-2.5 .5-2 .5-2 .5-2 1-2 1-2 1-2.5 1-3 1-3 



Per foot 56 .94 1.13 1.38 1.88 1.88 2.19 2.63 2.88 



For one end closed, per 



tube, add 19 .25 .25 .25 .31 .31 .44 .63 .81 



SILK, Oiled, in sheets 12x14 inches, each in a box Per sheet 



SIPHONS, Glass, plain form. 



No. 



Length of delivery tube, inches 



Each 



12182. SIPHONS, Glass, with suction tube. 



No 



Length of delivery tube, inches 



Each 



12184. SIPHONS, Glass, with suction tube and stopcock. 



No 



Length of delivery tube, inches 



Each . 



A 

 12 

 .40 



A 

 12 



.70 



A 



12 



2.50 



B 

 18 

 .50 



B 

 18 

 .80 



B 



18 

 2.75 



25 



1-3 



3.13 



.94 



.45 



C 

 24 

 .60 



C 

 24 

 .90 



C 



24 

 3.00 



