LABORATORY SUPPLIES AND CHEMICALS 



137 



2643(c) EXTRACTION APPARATUS, Sargent's, pat- 

 ented Dec. 23, 1913, Electrically 

 Heated, Revolving type. Will 

 accommodate any style or size 

 of glassware. Sliding condens- 

 ing tubes obviate the necessity 

 for moving the corks when once 

 placed. No valves or washers. 

 Adjustable in height. Requir- 

 ing only about a square foot of 

 space, may be set up in any out- 

 of-the-way corner. No rubber 

 tubing or clamps at condensers. 

 Only one connection at water 

 inlet and outlet necessary. Ar- 

 ranged for either 110 or 220 

 volts direct or alternating cur- 

 rent. 



Price without glassware $40.00 



In ordering, state voltage desired. 



2643(c) 



2644 



2644 (b) 



2644 EXTRACTION SHELLS, Whatman, fat free paper, for use in Soxhlefs and 

 other extraction apparatus. The use of these shells renders 

 it impossible for any of the material to find its way into the 

 solvent; can be used over and over again. Put up in boxes 

 of 25. 



Length, mm 80 80 80 90 94 123 



Diameter, mm 22 25 39 19 33 43 



Per box of 25 $3.15 3.55 3.55 3.15 4.40 7.10 



2644(a) EXTRACTION SHELLS, Whatman, as above, but of double thickness, will 

 not permit the finest substances to pass through; put up in 

 boxes of 25. 



Length, mm 80 80 80 90 94 123 



Diameter, mm 22 25 33 19 33 43 



Per box of 25 $5.28 5.92 5.92 5.28 7.36 11.84 



2644(b) EXTRACTION SHELLS, Alundum, for use with Soxhlefs and other extrac- 

 tion apparatus; may be used repeatedly and easily cleaned by 

 ignition. 



Length, mm 60 70 80 90 100 



Diameter, mm 26 25 30 19 34 



Shape at bottom Round Flat Flat Flat Round 



Each Net $0.40 .40 .45 .50 .60 



Above Shells are supplied in three degrees of porosity: RA84, 

 Dense; RA360, Medium; RA98, Porous. If no degree of poros- 

 ity is specified, RA98 will be sent. 



