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



31 



BALANCES, ANALYTICAL, VOLAND 



No. 454. 



No. 458. 



The balances listed below present certain new features in their construction, which should com- 

 mend their use in rapid yet precise chemical weighing. They are of simple construction, easily 

 adjusted, and with small danger of shifting sensibility since they are supported from a single point 

 on a broad central agate plane. The releasing mechanism is of the fallaway type, controlled by an 

 eccentric shaft turned by the milled head in the front. The red graduati&n of the index plate and the 

 white graduation of the black beam facilitate rapid, accurate readings. The short beam provides 

 short periods of oscillation. The patented rider arrangement makes it possible to work on either side 

 of the zero line and prevents the rider from slipping back on the shank of the hook. All bearings 

 are of agate. All cases are of mahogany finely finished, and provided with glass on all sides, admitting 

 light freely to all parts. The front door is counterpoised and slides freely. The list below includes 

 types from which one may select a balance for any kind of technical or analytical work. 



454. BALANCE, Analytical. 



Distinctive Features: 



Beam of hard bronze. 



Beam graduated in 100 divisions on each side of zero. 



Two vial levels in plain sight from front. 



Rear door can be raised or removed 



Base completely covered with heavy black plate glass and fitted with large drawer for weights. 



Patented rider arrangement provided with starter for swinging beam, operated from without case. 



Knife edges relieved from contact with bearings when not in use. 



Pan arrest separate from release; can be locked. 



Specifications : 



Dimensions of case....l6'4 x 19 x 



Length of beam 7 inches. 



Diameter of pans 2H inches. 



Width of bows 4 inches. 



Equipment Furnished: 



One pair 3 inch watch glasses. 



Three 10-niilIigram riders. 



Wood bench for specific gravity work. 



Price 5140 00 



456. BALANCE, Analytical. Same as No. 454, but with metal parts heavily gold-plated 150.00 



458. BALANCE, Analytical. Similar to No. 454, but of simpler construction. Beam of aluminum, 

 inches long, graduated in 50 divisions on each side of zero. Base of wood, with drawer. Di- 

 mensions of case, 16y2xl9x9y 2 inches high. Sensibility, 1/10 mg; capacity, 200 grams. 

 Furnished with one pair 3 inch watch glasses, two 5 mg riders, and a wood bench for specific 

 gravity work 85.00 



460. BALANCE, Analytical. Same as No. 458, but with heavy black plat* 

 hogany base 



inches. Capacity 200 grams. 



Sensibility l/20th milligram. 



Weight of rider 10 milligrams. 



lass base over the ma- 

 93.00 



