BAIRD &. TATLOCK. (LOM)ON) LTD. 



Small Travelling Microscope. In leather case TO] by 6J by 3$ inches. 



968-971 



968' Small Travelling Microscope (Leitz). This microscope is made ready for use by spreading 

 the foot, inserting the mirror, and setting the stage. It is provided with a micrometer 

 adjustment like Stand V., a coarse adjustment by rack and pinion, and a condenser 

 with iris diaphragm. The box accommodates three objectives, two eyepieces and a 

 brass box for a bottle of cedarwood oil. It is fitted with a lock and handle, and measures 

 lof by 6J by 3-4- inches. The whole apparatus weighs 5 Ibs. 



969' The Same Stand with objectives 3, 6, T V inch oil-immersion, N.A. 1.30 ; eyepieces I. 

 and III. ; magnifications 51 840 



970' Stand without condenser 



971 T Same Stand with objectives 2, 4, 7 ; eyepieces I. and III. ; magnifications 29 500 

 Petrological Microscope HIM (Leitz's), illustrated on page No. 203. 



The coarse adjustment is obtained by a rack and pinion mechanism, the fine adjustment by a micrometer 

 screw. The tube has a millimetre scale. At its lower end the tube carries a centring head with a slot and shutter 

 for the introduction of selenite and mica compensators. Above the centring head is a tube analyser which can 

 be drawn in and out. A Bertrand lens mounted in a slide plate is similarly accommodated in a slot in the upper 

 part of the tube. 



The condenser and polariser are raised and lowered by a worm screw. The change from convergent to 

 parallel light is obtained by a quarler turn of a milled head at the side, which throws out the two upper lenses of 

 the condenser. The polariser is marked at o, 90, 180 and 270, and withdraws easily from its sleeve. The stage 

 is divided into whole degrees and has a vernier, by means of which the amount of the rotation of the stage may be 

 read to ^ degree. The top of the stage is traversed by lines of orientation. 



972 r Petrological Microscope HIM (Leitz's) 

 Objective changing clutch with 4 adapters 



Achromatic objectives i*. 3, 6, T V inch oil-immersion, N.A. 1.30 

 Eyepieces I. and III. with sliding eyelens and cross webs 

 Micrometer eyepiece II., No. 1028.. 

 Stage micrometer, No. 1032 

 Selenite film, red ist order, and mica film J cm., both mounted 



Completely equipped microscope 



4 



11 15 



3 

 7 



21 5 



CROSS STREET HATTOTST GARDEKT, E- C 



53U.=-*5t 



