BAIRD &.TATLOCK (LONDON) LTD. 



POLARIZING APPARATUS, &c., FOR BAUSCH & LOME'S MICROSCOPES. 



1346-1347 



1348 



1349 



1345' Stage Micrometers. These micrometers consist of glass slides, measuring 75 by 25 mm., 

 upon which scales are mounted. 



A. Ruled to o.i and o.oi mm. 



B. Ruled to o.oi and o.ooi inches 



In order that the microscopist with only a regular microscope model may work with polarized light, we offer 

 these polarizers and analyzers. We list them separately so that any outfit may be made up ; both are necessary in 

 combination to produce the desired results. 





11 

 7 



Polarizers. 



These are designed for use in the substage ring and are so mounted as to be interchangeable with an Abbe 

 condenser. The best type of Nicol prism is used in fixed mounting. We supply two styles. Style C has one 

 removable selenite ; style D has three, interchangeable and mounted in metal rings, engraved to indicate the 

 colours to be obtained with polarized light. 



1346 1 No. 2035. Style C 

 1347' No. 2035. Stvle D 



250 

 2 16 3 



Analyzers. 



We also furnish two styles of analyzers. Both contain prisms of the Thompson type, cemented with linseed 

 oil, which gives the widest field of all forms of polarizing prisms. 



Style A is attached immediately above the objective. It has a prism so mounted as to be revolved, placing the 

 prism at any angle with reference to the polarizer. A society screw thread attaches the mounting to the body tube 

 of the microscope while the objective screws into another society thread at the lower end of the mounting. 



Style B is used above the eyepiece. The Thompson prism is placed in a mounting to which is attached a collar 

 graduated in two-degree divisions, with every tenth line numbered. The prism also is adjustable vertically with a 

 suitable range, to get the proper field of view. It allows the full field of the eyepieces to be utilized up to, and 

 including, the 7.5 x , but cannot be expected to do so with the 10 x and 12.5 x because of the very wide field ot 

 those eyepieces. The cylindrical base of the analyzer fits over the draw-tube and is securely attached by means 

 of a set-screw, which permits a fixed zero point to be established. The prism mounting, including the graduated 

 collar, is removed from the base to permit the insertion of the eyepiece of the microscope ; it is then replaced in 

 the smoothly fitting outer collar. 



1348'' Style A 

 1349' Style B 



1 17 6 

 2 16 3 



CROSS STREET HATTON GARDEN, E-C 



268 



