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



55 



No. 653. 



No. 700. 

 No. 702. 

 No. 706. 



658. BALANCE, Triple Beam, Cenco, for physical and chemical laboratories. The three beams are 

 placed in the same horizontal plane, thus conforming to scientific principles involved, which is 

 not true of other styles of Triple Beam Balances. Weighings are obtained by movement of the 

 riders along the beams. These riders are easily handled and quickly placed in the notches, but 

 cannot be removed from the beams. An adjustable support is .provided for a jar or other 

 receptacle for experiments in specific gravity. Provided with stable base neatly japanned, and 

 with sensitive spirit level and leveling screw. Balance neatly finished in nickel plate and 

 japan. Capacity of middle beam, 100 grams by 10 gram divisions; back beam 10 grams by 1 

 gram divisions; front beam, 100 centigrams by 1 centigram divisions. Total capacity, 111 

 grams; sensibility, with or without full load, guaranteed to 1 centigram. Actual tests, how- 

 ever, give a sensibility of from 4 to 8 milligrams. Diameter of pan, 9.5cm; width of bow, 

 10.5cm; height of bow, 22cm. Features easily recognized are: rapid weighing, constant sensi- 

 bility, accuracy, freedom from loss of weights, no interference or breaking of weights. . . $17.50 



660. WEIGHT, Extra, for use with No. 658, for weighing over 111 grams, but not to exceed 

 grams. Weight is placed on the 100 gram notch of the middle beam. Sold only at the 



time with No. 658. 



201 

 same 

 1.75 



WEIGHTS, ANALYTICAL 



700. WEIGHTS, Analytical, Gold Plated, Highest Accuracy, adjusted to meet the requirements of the 

 United States Bureau of Standards, Class M. Useful for checking accuracy of other weights. 

 Gram weights made of Tobin bronze, one piece heavily gold plated; fractions of gram of plat- 

 inum with 3 10 mg riders. In polished mahogany velvet lined box with hinged covers. Fur- 

 nished with United States Bureau of Standards Certificate. 



No. A B 



Size 1 mg to, grams 50 100 



Per set., 59.50 64.00 



702. WEIGHTS, Analytical, adjusted within the tolerance of the United States Bureau of Standards 

 for analytical work. All gram pieces are of brass, heavily gold plated. The fractionals from 

 500 mg to 50 mg are of Bhotanium A and from 20 mg to 1 mg of aluminum with 3 10 mg riders. 

 In polished mahogany velvet lined box, with hinged cover, and with forceps. Each weight 

 fitted in separate compartment. 



No. A B C D E F 



Size 1 mg to, grams 20 50 100 200 500 1000 



Per set 23.00 25.00 28.00 37.00 44.00 53.00 



704. WEIGHTS, Analytical, same as No. 702, but furnished with United States Bureau of Standards 

 Certificate. 



No. A B 



Size 1 mg to, grams 50 100 



Per set 40.50 43.75 



7"0. WEIGHTS, Analytical, same quality as No. 702, but carefully lacquered instead of gold plated. 

 No. A B " C D E F 



Size 1 mg to, grams 20 50 100 200 500 1000 



Per set 21.00 22.00 24.00 30.00 36.00 43.00 



