54 



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



No. 648. 



No. 652. 



No. 650. 



No. 654. 



C48. BALANCE, Trip Scale, Cenco Agate Bearing, Harvard design. In this trip scale we have done 

 away with the rough cast and forged iron parts used for years in the Harvard Trip Scale, and 

 employ parts of brass and steel neatly formed by elaborate tools and machinery. This makes 

 possible a degree of perfection never before attained in assembling this style of balance. We 

 have discontinued altogether the cheap imported balances of the Robervahl type, as we believe 

 the superior accuracy and durability of the Cenco Trip far outweighs the slight difference in 

 price. The BEARINGS consist of HARDENED STEEL PRISMS resting on SIX AGATE 

 SHELVES of large dimensions. This construction adds very materially both to the initial sen- 

 sibility of the scale and to its ability to retain its sensibility after long continued use. The 

 graduated beam has a range of 10 grams in 1/10 gram divisions. The capacity of the scale is 

 2000 grams. Sensibility is guaranteed to be 1/10 gram. Actual tests show a much greater 

 sensibility. 



A very convenient feature of our latest design is a hook placed directly below the knife edges 

 of each scale pan, from which objects may easily be suspended for specific gravity work. A 

 set screw is also provided by means of which the balance may be clamped to a 13 mm support 

 rod, and so elevated above the table top $7.50 



650. SUPPORT, for No. 648 Trip Scale. Consists of a table clamp of special design (No. F197), and 

 a No. F133 Support Rod, 20 cm long. This forms a most convenient means of supporting No. 648 

 Trip Scale for specific gravity work, as the scale is provided with a set screw for clamping to a 

 support rod, and with specially designed hooks for supporting specimens which are to be weighed 

 under water 1.25 



652. BALANCE, Dispensing and Solution Scale, with Agate Bearings as described under No. 648. This 

 balance will be found ideal for laboratory and pharmaceutical work. The pans are of heavy 

 nickeled brass, 15 cm in diameter. The graduated beam has a range of 10 grams in 1/10 gram 

 divisions, and brass weights from 10 grams to 100 grams are supplied, conveniently fitted into a 

 projecting holder. Capacity, 2,000 grams. Sensibility is guaranteed to be 1/10 gram; actual 

 tests show a much greater sensibility 10.00 



654. BALANCE, Grain Test. Consists of No. 648 Cenco Agate Bearing Trip Scale with the addition 

 of a funnel scoop and counterpoise, accurately adjusted 10.00 



656. FUNNEL SCOOP AND COUNTERPOISE, only, of No. 654 2.50 



