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



153 



f 



No. 3010. 



No. 3014. No. 3016. No. 3018. No. 3020. No. 3022. No. 3024. No. 3026. 



COLOR COMPARISON TUBES 



3010. COLOR COMPARING CYLINDERS, Helmet, for the estimation of iron in -water, consisting of *wo 

 graduated tubes of the same size and graduation, with stop-cocks and metal feet.. per pair $6.00 



3014. COLOR COMPARISON TUBES, Camp, graduated for manganese determination in steel. Larger 



tube has glass stopper ground in per set 6.00 



COLOR COMPARISON TUBES, Eggertz, for the estimation of carbon and manganese in steel by 

 the colorimetric method. 



No A B C 



Capacity, cc 30 50 100 



Graduated in, cc Mo Mo M> 



3016. Per set of two 3.00 3.60 5.00 



3017. Per set of four 6.00 7.20 10.00 



COLOR COMPARISON TUBES, Eggertz, same as No. 3016, but with ground in glass stopper. 



No A B C 



Capacity, cc 30 50 100 



Graduated in, ec Mo Mo M; 



3018. Per set of two 3.90 4.50 5.90 



3019. Per set of four 7.80 9.00 11.80 



COLOR COMPARISON TUBES, Julian's, same as No. 3016, but with bent ends to permit mixing 

 of contents without using a stopper. The lower portion of the tube is ungraduated. 



No A B C 



Graduated from, cc 5 to 30 10 to 50 10 to 70 



Graduated in, ec Mo Vio % 



3020. Per set of two 3.30 4.20 4.80 



3021. Per set of four 6.60 8.40 9.60 



COLOR COMPARISON TUBES, Julian's, same as No. 3020, but with funnel tops to facilitate 

 pouring in the sample. 



No A B C 



Graduated from, cc 5 to 30 10 to 50 10 to 70 



Graduated in, cc Mo Mo % 



3022. Per set of two 3.50 4.40 5.00 



3023. Per set of four 7.00 8.80 10.00 



3024. COLOR COMPARISON TUBES, Nessler, usual form for ammonia test, of clear colorless glass 



with polished bottoms. 



No A B C 



Graduated at, ee 50 100 50 & 100 



Each 65 .80 .90 



COLOR COMPARISON TUBES, Nessler, American Public Health Association Standard. Tall form 

 of clear glass with polished bottoms. Graduations agree within 6 mm and are about 210 mm 

 on 50 cc tube and 325 mm on the 100 cc tube from the bottom. (See Standard Methods of 

 Water Analysis for 1915, pages 16 and 18.) In sets to agree. 



No A B C 



Graduated at, ce 50 100 50 & 100 



3026. Each .85 1.30 1.60 



3027. Per set of six 5.80 8.60 10.55 



3028. Per set of twelve 12.00 18.00 22.50 



