312 CENTRAL SCIENTIFIC CO., CHICAGO, TJ. 8. A. 



No. 7660. 



7644. HYDROMETERS, Specific Gravity Scale, for heavy liquids, medium grade, graduated in 0.005 

 divisions. Length, about 11 inches. 



No A B C D E 



Eange, gravity 1.000-1.200 1.200-1.400 1.400-1.600 1.600-1.800 1.800-2.000 



Each $0.75 .75 .75 .75 1.00 



7646. HYDROMETER, Specific Gravity Scale, for heavy liquids, medium grade, graduated from 1.000 

 to 2.000 in 0.01 divisions. Length, about 11 inches 50 



7C51. HYDROMETERS, Specific Gravity Scale, for light liquids, highest quality, graduated in 0.002 

 divisions. Length, about 11 inches. 



No A B C D 



Range, 0.600-0.700 0.700-0.800 0.800-0.900 0.900-1.000 



Each 2.75 2.50 2.50 2.50 



7652. HYDROMETERS, Specific Gravity Scale, for light liquids, medium grade, graduated in 0.002 

 divisions. Length, about 11 inches. 



No A B C D 



Range, gravity 0.600-0.700 0.700-0.800 0.800-0.900 0.900-1.000 



Each 75 .75 .75 .75 



7654. HYDROMETER, Special Gravity Scale, for light liquids, medium grade, graduated from 0.700- 

 1.000 in 0.005 divisions. Length, about 11 inches 50 



7658. HYDROMETER, Combined Baume and Specific Gravity Scales, for heavy liquids, ordinary grade, 

 graduated from to 70 Baume in 1" divisions, and from 1.000 to 2.000 specific gravity in 

 0.01 divisions. Length, about 11 inches 45 



7660. HYDROMETER, Combined Baume and Specific Gravity Scales, for light liquids, ordinary grade, 

 graduated from 100 to 10 Baume in 1 divisions, and from 0.600 to 1.000 specific gravity in 

 0.005 divisions. Length, about 11 inches 45 



7664. HYDROMETER, Universal, Combined Baum6 and Specific Gravity Scales for light and heavy 

 liquids, medium grade, graduated from 100 to 10 and to 70 Baume. in 1 divisions; from 

 0.700 to 1.000 in 0.005 divisions, and 1.000 to 2.000 in 0.01 divisions. Length, about 15 

 inches 1.25 



HYDROMETERS FOR SPECIAL USES 



HYDROMETERS, Acid, see Hydrometers, Baume. 



7670. HYDROMETER, Acid. Specific Gravity Scale, medium grade, for use in Babcock Milk test. 

 Graduated from 1.800 to 1.850 in 0.001 divisions. Length, 6 inches 70 



7672. HYDROMETER, Actinometer Scale, ordinary grade, for photographic uses, graduated to 80 

 in 1 divisions. Length, 5 inches. Complete with test jar in wooden case 35 



7674. HYDROMETERS, Alcohol or Spirit, United States Internal Revenue, Per Cent, of Proof Scale, 

 highest quality. Length, about 8% inches. 



No A B C D E 



Kange, degrees 0-100 80-120 100-140 130-170 160-200 



Graduated in, degrees 1 % % % % 



Each 2.25 2.25 2.25 2.25 2.25 



7676. HYDROMETER, Alcohol or Spirit, Per Cent, by Volume (Tralle) Scale, highest quality. Widely 

 used in determining percentage of alcohol in beer according to the requirements of the Fed- 

 eral government. Graduated from to 5 in ^ divisions. Length, 8% inches 5.00 



7678. HYDROMETER, Alcohol, Proof and Tralle Scales, medium grade, graduated from 100 below 

 to 100 above Proof, and from to 100 Tralle in 1 divisions. Length, about 11 inches .50 



7680. HYDROMETER, Alcohol, United States Custom House, Proof and Tralle Scales, medium grade, 

 with enclosed thermometer. Graduations same as No. 7678. Length, about 18 inches. With 

 correction scale 3.00 



7684. HYDROMETER, Alkali. Baume Scale, medium grade, graduated from to 60 in 1 divisions. 

 Length, about 11 inches .50 



7686. HYDROMETER, Ammonia, Baume Scale, medium grade, graduated from 10 to 50 in % divi- 

 sions. Length, about 11 inches 50 



HYDROMETER, Asphalt, see Nos. 379 and 380. 



7690. HYDROMETER, Barkometer Scale, for tanning liquids, highest quality, with enclosed ther- 

 mometer, graduated from to 70 (1,000 to 1.070 specific gravity) in 1 divisions. Length, 

 13 inches 5.80 



7692. HYDROMETER, Barkometer Scale, for tanning liquids, medium grade, graduated from to 

 65 (1.000 to 1.065 specific gravity) in 1 divisions. Length, about 11 inches 50 



