

BAIRD &.TATLOCK (LONDON) LTD. 



A5841 1 Polariscope, F. Schmidt & Haensch, after designs of Dr. Herzfeld, and as supplied to 

 the laboratories of the German sugar industry. 



Fitted with double quartz wedge compensator, well protected by metal case, and mounted on heavy cast- 

 iron base. 



The instrument is fitted with revolving drum, and arranged for five observation tubes for continuous polari- 

 sation, and thus by means of a slight movement a second tube can be brought in front of the telescope, thus 

 permitting quick successive tests. 



The single tubes are numbered so that each test can be readily brought in front of the observation distance 

 tube as required, the tubes being so placed that any shaking of the liquid is prevented. 



Price, adapted to take tubes up to 600 millimetres long 

 One Case for storing above, with glass side, No. 5830 

 One Lamp as No. 5856 (for other lamps see Nos. 5855-5862) 

 One set of 15 tubes, 5 each 200, 400, 600 millimetres long 

 Price of complete outfit 



143 



6 10 



180 



10 



160 18 





5842 



>842 T Polariscope, half shadow, by F. Schmidt & Haensch (Landolt's Apparatus with Lippich's 

 Polariser), of newest construction, with large silvered circle divided in o, reading by 

 verniers and magnifiers to 0.01, and dust protector for the circle, with one each observation 

 tubes (water jacketed) of 400, 300, 200, and 100 millimetres long, in glass case . . 95 



843 1 Landolt's Sodium Gas Lamp, suitable for above .. .. .. .. 3 15 



844 T Polariscope, as No. 5842, fitted with triple field, specially adapted for use in the 



tropics and with Landolt's sodium gas lamp . . . . . . . . 106 



The polariser consists of a fixed Glan Nicol which occupies the entire field, and a movable Nicol filling only 

 ic-half of the field. By rotating this latter Nicol the brightness of the penumbra may be regulated. While 

 e sodium light only can be used with Laurent's polariscope, with this instrument any kind of homogeneous light 

 ay be employed. 



There is an arrangement allowing two tubes to be used at the same time, and by means of the lever M one or 

 .her can be brought into the field if desired. The instrument is very sensitive, the scale is capable of being read to 

 31, and since it can be used for the determination of magnetic rotation, it is stated to be specially adapted for 

 .entific purposes. 



(CHEMICAL AND SCIENTIFIC APPARATUS AND PURE CHEMICALS. 



1067 



