LABORATORY SUPPLIES AND CHEMICALS 141 



2673 



2673 FILTER CONES, Alundum, for the rapid and complete separation of precipi- 

 tates from solutions by means of suction. They may be used in any 

 sixty degree funnel and are placed in operation, by stretching a wide 

 band of rubber tubing over the funnel. 



No 7241 7056 7730 



Diameter, inches 1^4 2% 4J^ 



Height, inches 1& 1^ 3}^ 



Each $0.30 .35 .50 



Above cones can be furnished in three degrees of porosity, R A 320 

 Dense; R A 321 Medium; R A 322 Porous. 



If no degree of porosity is specified R A 322 will be sent. 



2678 



2678 FILTER PLATES, Hirsch Porcelain. Glazed, Perforated Beveled edges for 

 use in funnels. 



Size No 1 2 3 4 5 



Diameter, mm 21 25 38 50 75 100 



Each $0.25 .30 .35 .40 1.00 1.50 



2679 FILTER PLATES, Alundum, can be used in place of Hirsch plates in many 



operations. Made with straight or 60 degree beveled edge. Supplied 

 in two degrees of porosity, R A 225 medium and R A 98 porous. 



Diameter, inches $4 1 1 2 3 4 



Thickness, inches A ik -fa & l /i A 



Edges Straight Straight Bevel Bevel Bevel Bevel 



Each $0.25 .25 .25 .35 .50 .75 



If no degree of porosity is specified R A 98 will be sent. 



2680 FINGER COTS, Black rubber, thin or thick, per dozen $0.60 



