No. :,1 .VI!). 



Analytical Balances. Precision Balances. 



233 



51 529. 1 : 6. 



51533 (51537), 51578. 1 : 8. 



Analytical Balance, also suitable for specific gravity determinations, cf. Fig. 51,533, with 

 agate planes, gilt or platinised pans, mahogany-glass case with 4 sliding windows, alu- 

 minium beam with quick-swing pointer, on white or black plate glass base, with rider 

 slide when case is closed. The following are not included in the price: the stage, the 

 glass vessel, the Eeimann thermometer flask, the rider weights and counterpoises. 



s. d. 



Prices exclusive of Rider Weights. For Sets of Weights and Rider Weights, see pp. 241243. 

 The preceding, without iron or steel parts, agate axes. 



List No. 



To carry 



Sensitivity 



Price 



51,535 

 5 



0.1 

 6.5.0 



51,539. Precision Balance for Rapid Work, Figure on p. 234, for load of 200 g, with lens- 

 mirror reading and two superposed scales, case with sliding windows and side doors, 

 axes and bearings of best agate, mounted on marble slab 



In order to read the tenth-milligrams direct with this quick-swing balance, a power 5 lens-mirror 

 (achromatic objective with silver coating) is fixed on the pillar and magnifies, without reflex or distor- 

 tion, the whole of an opal glass scale, divided in V.-,' 118 mm , fitted about 20 mm above the ivory scale. 



The whole milligrams are read off on the ivory scale; the tenth-milligrams being determined 

 by glancing at the glass scale on the mirror for purposes of confirmation. 



As therefore the mirror and the magnification which is read by both eyes is only used at the 

 last moment, the eyes are not in any way strained. The work with both scales is excellent, sure and 

 rapid. The deflection with all loads is, in the mirror, 10 and on the ivory scale 2 per milligram. 



Extra if mounted on glass slab 



If Microscope Reading is fitted in place of the mirror the balance is increased in cost by . . 



9. 10. 



0. 5. 



1. 5. 



Cl. 5495, 3939. 



