BAIRD &. TATLOCK (LONDON) LTD. 



1401' Swift's Compensating Oculars. For Continental Tube, 160 mm. 

 Magnification 

 Price 



Magnification 

 Price 



1403 T Swift's Huyghenian Oculars. 



Designation 

 Magnification 

 Price 



1404 

 1404 T Swift's New Dark Ground Condenser. 



This dark ground Condenser was designed, and is primarily intended for, the examination, under high powers, 

 of living unstained bacteria. As it brings the rays to a focus by reflection only, and not by refraction, it is absolutely 

 free from chromatic aberration and, owing to the design and disposition of the two reflecting surfaces, the various 

 forms of spherical aberration are reduced to a minimum. They are present in a far less degree than in the most 

 carefully ground paraboloid, which surface it is mechanically impossible to polish absolutely true to figure. The 

 condenser is computed to work through slips varying from i mm. to 1.25 mm. in thickness, and to give satisfactory 

 results with a comparatively weak source of light. A descriptive leaflet will be sent on application. Full instruc- 

 tions accompany each condenser 



Dark Ground Condenser, with R.M.S. standard screw 

 Centring Adjustment for same 



Stop for reducing aperture of immersion objectives . . . . 1 6 to 



The internal diameter of the Substage should be given when a 

 Centring Adjustment is ordered. 



CAMERA LUCID,*. 



1405 T Swift-Ives Camera Lucida. This is a modification of the well-known Abbe pattern 

 in which the large mirror is replaced by a small total reflecting prism. It can be used 

 with the Microscope either vertical or inclined 



1406 T Wollaston's Camera Lucida with two adjustable lenses for rendering the object and 

 pencil equally visible 



1407 1 Wollaston's Camera Lucida as above, without lenses 



POLARISING APPARATUS. 



1408 T Polariser to fit Substage and Rotating Analyser 



1409 T Ditto ditto Fixed ditto.. 



1410 T Smaller ditto ditto 



141 1 T Analyser fitted to slide in and out of body of Microscope 



1 10 



10 

 2 



1 5 



1 5 

 17 



200 

 1 10 

 150 

 1 10 



When a Polariser is ordered the inside diameter of the substage of the Microscope should be given. 



14 -CROSS STREET HATTON GARDEN, E- C 



