50 



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



No. 708. 



No. 716. 



No. 718. 



No. 720. 



No. 710. 



708. WEIGHTS, Analytical, Precision, for use with Nos. 450 and 452 Chain Balances. Of lacquered 

 brass, with fractional weights from 5!)0 mg to 50 mg of platinum. Adjusted to within the 

 tolerance of Class 8 Bureau of Standards. In polished velvet lined mahogany box. Complete 

 with forceps. 



No. ABC 



Size 50 mg to, grams 20 50 100 



Per set $22.00 23.00 26.00 



710. WEIGHTS, Analytical, Fractions of Grams, of same quality as supplied in above sets. In pol- 

 ished wooden box with slip lid, with separate compartment for each weight. 1-2-5-10-20 mg 



pieces of aluminum; 50-100-200-500 mg pieces of Rhotauium A per set 19.00 



7 '.2. WEIGHTS, Analytical, Fractions of Grams, same as No. 710, but priced singly. 



/ Aluminum , , Rhotanium A < 



Size, mg 1 2 5 10 20 50 100 200 500 1000 



Each 60 .60 .60 .60 1.00 1.50 2.00 3.00 4.50 8.00 



WEIGHTS, Analytical. These weights are the same quality as No. 706, except the fractionals 

 are of 22-caret solid gold, thus reducing the price due to the excessive cost of Rhotanium fractionals. 



No. A B C D 



Size 1 mg to, grams 10 20 50 100 



714. Per set 14.00 15.50 18.00 21.00 



715. Per set with Bureau of Standards Certificate 38.50 41.00 



716. WEIGHTS, Analytical, Fractions of Grams, of 22-carat gold, as supplied with No. 714, in polished 



wooden box with slip lid, with separate compartment for each weight. Weights below 50 milli- 

 grams are of aluminum 9.00 



717. WEIGHTS, Analytical, Fractiors of Grams, same as No. 716, but priced singly. 



i Aluminum , , Gold > 



Size, mg 1 2 5 10 20 50 100 200 500 



Each '. . . .45 .45 .45 .65 .65 .95 1.20 1.30 1.50 



718. WEIGHTS, Analytical, designed for student use, accurately adjusted. Gram pieces of solid brass, 



polished and lacquered. No loose balancing material used as all adjustments are made on 

 knob stem. Fractionals of aluminum, the box of natural mahogany with hinged lid, velvet 

 lined, with separate compartment for each weight. A pair of brass forceps is supplied. 



No A B 



Size 1 mg to, grams 50 100 



Per set 10.50 11.75 



719. WEIGHTS, Analytical, same grade as above except in block without hinged lid. 



No A B 



Size, 1 mg to, grams 50 100 



Per set 9.25 10.50 



720. RIDERS, Analytical, of aluminum, very carefully adjusted. 



Size, mg 12 10 6 5 3 2 1.2 1 .6 .5 



Each 35 .35 .35 .35 .55 .55 .55 .55 .55 .65 



