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



235 



No. 5284. 



No. 5292. 



n 



No. 5290. 



No. 5312. 



5284. 

 5286. 



5288. 

 5290. 



5292. 

 5296. 

 5298. 

 5300. 

 5302. 

 5306. 



5312. 

 5314. 



No. 5296. 



No. 5298. 



Nos. 5314-16. No. 5300. 



CHART, Frost's Gasometer, for measuring gas in fermentation tubes $0.10 



FERMENTATION TUBE, Standard, as adopted by the American Public Health Association. 

 Length of closed tube, 140 mm; diameter of tube, 15 mm; diameter of bulb, 38 mm. On glass 

 foot. (See "Standard Methods of Water Analysis," 1915, page 137) 50 



FERMENTATION TUBE, Standard, same as No. 5286, but without glass foot 35 



FERMENTATION TUBE SUPPORT for single tubes. Of wood with brass clip for holding 

 tubes .^ _._._. 1.00 



FERMENTATION TUBE SUPPORT, of metal, for holding 10 fermentation tubes. Can also be 

 used for test tubes, ureometers, and any tubes not less than 5 inches long 1.60 



FIGURES, Steel, see Dies No. 3820. 



FILES, Rat Tail, bastard cut. 



Length of cut portion, inches 4 5 6 8 



Each 14 .16 .18 .20 



FILES, Triangular, slim tapers, single cut, for use in the laboratory for cutting glass tubing. 



Length of cut portion, inches. 



Each 



FILES, Half Round, bastard cut. 



Length of cut portion, inches 



Each 



FILES, Half Round, cabinet wood rasps. 



Length of cut portion, inches 



Each 



FILE HANDLES, soft wood with ferrule. 



Diameter, inches 



Each 



Per dozen 



3 

 .08 



4 

 .10 



5 

 .12 



FILTERING APPARATUS 



i 



.03 

 .30 



6 

 .U 



8 

 .50 



.84 



.03 

 .30 



8 

 .22 



10 

 .62 



10 

 1.04 



.03 

 .30 



FILTERING APPARATUS, consisting of Glass Bell Jar No. 1162, with heavy glass plate ground 

 to make air tight seal, two-hole rubber stopper, 2% inch funnel, and L tube. 



No A B 



Size of bell jar, inches 5x9 6%xl 1 



Size of glass plate, inches > 6x6 8x8 



Each 4.50 5.00 



FILTERING APPARATUS, Berkefeld Type, consisting of a porous cylinder fitted with metal 

 head piece and outlet tube, and provided with glass mantle for holding liquids. Extensively 

 used for sterilizing liquids of all kinds, filtering serums, toxins, etc., and in separating bacteria 

 from cultures. They should be used in conection with Filter Flasks, No. 5664, attached to a 

 filter pump or other means of exhausting air. Without flask or pump. 



No A B C D E F 



Height of cylinder, inches 1% 2% 5 8 8 10 



Diameter of cylinder, inches % % 1 >& '.. 1% 2 



Each 1.65 2.00 3.50 4.25 4.40 5.25 



