i 

 BAIRD &TATLOCK (LONDON) LTD. 



Polariscope. Double Compensating Instrument. 



5834-5836 



5834 T Polariscope, F. Schmidt & Haensch, with half-shadow double- 

 wedge compensator, for use with tubes 100-200 millimetres, with 

 two tubes 100 and 200 millimetres long, and with dust protector for 

 analyser. Price, on Bock stand, with glass case, Fig. 5830 



Lamp for above extra, see Nos. 5855 and 5862. 



5835 T Polariscope, as above, for use with tubes 100-400 millimetres, with 

 three tubes 100, 200, and 400 millimetres long. Price, on Bock stand, 

 with glass case, Fig. 5830 



Lamp for above extra, see Nos. 5855 to 5862. 



5836 1 Polariscope, as above, for use with tubes 100-600 millimetres, with 

 four tubes 100, 200, 400, and 600 millimetres long. Price, on Bock 

 stand, with glass case, Fig. 5830 



Lamp for above extra, see Nos. 5855 to 5862. 

 5837 1 Triple field arrangement, fitted to any of above Polariscopes extra 



Prices, special! 



adapted lor Ui 



in the tropics. 



42 42 17 



45 45 17 



50 50 17 6 



576 



This instrument has within recent years come into very general use as a saccharimeter. It shows a divided disc 

 of a uniformly yellowish grey colour when set at zero, the halves rapidly changing to dark or light when an optically 

 active solution is introduced. It carries a saccharimetric scale showing direct percentage of sugar like the Ventzke- 

 Schcibler, and is used with ordinary instead of monochromatic light. The various parts of the instrument are 

 very similar to the one previously described, the exception being the arrangement of the compensating system. 



In the previously described instrument a pair of quartz wedges and the compensating plate are necessary, 

 whereas in this instrument there are two pairs of quartz wedges, the compensating plate being replaced by a pair 

 of quartz wedges of exactly similar proportions to the first pair, but having an opposite rotation. One of these 

 pairs of wedges is immovably fixed in the instrument, whilst the other is horizontally movable at right angles to 

 the axis. By such arrangement the instrument is rendered extremely sensitive. 



CROSS STREET HATTOlsT GARDETST, E-C 



1064 



