488 



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







No. 13364. No. 13370. No. 9332. No. 13382. No. 13390. 



No. 13366. No. 9330. No. 9334. No. 13386. No. 13400. 



13364. TEST TUBES, Thin Wall, non-corrosive glass, with lip, for chemical work. 



No A B C D 



Length, mm 100 120 150 175 



Diameter, mm 12 15 18 22 



Per dozen $0.25 .30 .35 .65 



Per gross 2.15 2.65 3.05 5.30 



13366. TEST TUBES, Thick Wall, non-corrosive glass, without lip, for bacteriological work. 



No A B C D 



Length, inches 3 4 5 



Diameter, inches % % % % 



Per dozen 40 .45 .50 .55 



Per gross 3.40 3.80 4.30 4.65 



E 



200 

 25 

 .70 



6.60 



E 



8 



1 



1.10 

 9.90 



13370. TEST TUBES, Thick Wall, Pyrex glass, without lip, for combustion and ignition purposes, thick- 

 ness of wall, about 1M> mm. 



No. 



Length, mm.. . 



Diameter, mm. 



Per dozen 



Per gross 



A 



100 



16 



1.25 



12.50 



B 



125 



16 



1.50 



15.00 



C 



150 



19 



1.80 



18.00 



9330. 

 9332. 

 9334. 



13382 

 13386 



D 



200 

 25 

 7.20 

 72.00 

 .90 

 .90 

 .90 



TEST TUBES, Butter Fat Oil, plain, 9x?4 inches per dozen 



TEST TUBES, Butter Tat Oil, with line 5 inches from bottom per dozen 



TEST TUBES, Cream, heavy, for samples, 5x1% inches per dozen 



TEST TUBES, Ignition, with bulb at bottom, see Reduction Tubes. 



TEST TUBES, Potato Culture, ordinary glass, with lip, with constriction and bulb at the bot- 

 tom. Length, 150 mm; diameter, 18 mm per dozen .90 



TEST TUBE, Titer Tube, ordinary glass, with lip, for determining the melting and solidifying 

 points of fats, and waxes. Length, 4 inches; diameter, 1 inch; thickness of wall, about 1 mm. 

 (See Journal of the Association of Official Agricultural Chemists, Vol. II, No. 3, part II, 

 November 15, 1916, page 303; Journal of Industrial and Engineering Chemistry, Vol. X, No. 



4, for April 1918, page 317) 90 



13390. TEST TUBES, Wassermann, Thin Wall, non-corrosive glass, with lip, for serological work. 



Length, mm 75 100 



Diameter, mm 10 12 



Per dozen 20 .25 



Per gross 2.00 2.15 



13394. TEST TUBES, Opaque Fused Silica, heavy wall, with lip. 



Length, inches 4 5 6 7 



Diameter, inches V> % % % 



Each 1.06 1 50 2.20 2.81 



13396. TEST TUBES, Transparent Quartz, valuable for rapid heating, since they may be applied to 

 the hottest flame without fear of cracking. 



Length, mm 100 100 120 125 150 150 



Diameter, mm 10 15 15 20 20 25 



Each 1.32 3.12 3.60 4.80 5.40 6.90 



TEST TUBE BRUSHES, see Brushes. 



13400. TEST TUBE FILLING ATTACHMENT, for measuring out exact quantities of culture media 

 and other chemical fluids. Consists of a separatory funnel with three-way stop-cock, to one 



arm of which is attached a graduated side tube. Capacity, 250 cc 3.50 



TEST TUBE HOLDERS, see Clamps. 

 TEST TUBE SUPPORTS, see Supports. 



