BAIRD &.TATLOCK. (LONDON) LTD. 



cr 





1375 



1378 



Swift's " Universal " Microscope. 



The coarse and fine adjustments and general construction of this instrument are as described on page 275. It is 

 fitted with the most complete mechanical stage yet designed. The cross motion is effected by a steel worm of new 

 and original design, and the vertical motion by a fine rack and pinion. As the clips which grip the slide are 

 movable against a scale and vernier, it is possible systematically to search over the entire surface of a 3 in. by 

 t in. slide. The entire stage rotates through an angle of about 270 and has centring screws by which its centre of 

 rotation can be set absolutely true to any objective. Both the vertical rackwork movement and the rotation 

 are provided with effective clamps to prevent creeping due to vibration. The horizontal mechanical movement is 

 removable to allow of the use of a Petri dish. For rough work the entire mechanical stage can be taken off the 

 instrument, and be replaced by a plain vulcanite covered stage 



1375' Stand as described, in mahogany cabinet, with the following accessories : 



Objectives f in. N.A. 0.30 ; | in. N.A. 0.85, and T ^ in. oil-immersion, N.A. 1.30 . . 



Oculars II. and IV. 



Abbe Condenser with iris diaphragm and stop carrier, dustproof triple nosepiece 



1376' The same set as above, but without T \- in. oil-immersion objective 



Although the sets are quoted with g in. and ^ in. objectives, the jj in. may be replaced by a i in. or J in., and 

 the i in. by a J in. or I in. ; also any of the Huyghenian oculars I.-V. may be taken in place of those named. 



1377 1 Plain vulcanite covered rotating stage, to interchange with mechanical stage . . extra 



Swift's " I.M.S." Microscope. 



This Stand, which was specially constructed for use in the Indian Medical Service, was built to meet the 

 requirements of Col. Sir W. B. Leishman. It is intended for bacteriology, haematology, and the most advanced 

 medical research work.. 



The coarse and fine adjustments and general construction of this instrument are as described above. The 

 mechanical stage is the great feature, as with it it is possible systematically to search over and examine the entire 

 surface of a 3 in. by i in. slide. The cross motion is effected by a steel worm of new and original design, and the 

 vertical motion by a fine rack and pinion. There are three scales and verniers reading to -fa mm - The entire cross 

 movement can be instantly removed when the stage will accommodate a full-size Petri dish. 



1378 1 Stand as described, in mahogany cabinet, with the following accessories : 

 Objectives in. N.A. 0.30 ; in. N.A. 0.85 ; T V in. oil-immersion N.A. 1.30 

 Oculars II. and IV. 

 Abbe Condenser with iris diaphragm and stop carrier, dustproof triple nosepiece . . 



1379 T The same set as above, but without ^ in. oil-immersion objective 



Although the sets are quoted with in. and J in. objectives, the f in. may be replaced by a i in. or J in., and 

 the J in. by a J in. or J in. ; also any of the Huyghenian oculars I.-V. may be taken in place of those named. 



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150 



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CROSS STREET HATTON GARDEN, E-C 



276 



