ST. 



BAIRD & TATLOCK. (LONDON) LTD. 



1287-1289 



CHEMICAL MICROSCOPE M (BAUSCH & LOME'S). 



SPECIFICATIONS. 



Base. Horse-shoe form. 



Pillar. Round ; provided with inclination joint, having vertical and horizontal stops. 



Arm. Handle type ; provides ample space for manipulation of object. 



Body Tube. Outside diameter, 35 mm. ; provided with society screw thread ; draw tube graduated in single 

 millimetres with every tenth line numbered, adjustable in cloth lined sleeve, and provided with society screw thread 

 for the use of low power objectives. 



Focussing Adjustment. Coarse adjustment by standard rack and pinion ; fine adjustment of our lever type 

 with two-sized knurled head for slow and rapid movement, ceasing to operate if objective touches the slide. 



Stage. Circular, revolving with knurled edge, graduated on circumference in single degrees, with every tenth 

 line numbered, and read by a conveniently placed pointer ; measures 88 mm. outside and 78 mm. inside graduations 

 with a distance of 58 mm. from centre to base of arm ; has vulcanite top and is provided with spring clips and 

 centring screws. 



Substage. Adjustable for focus by quick-acting screw of long range ; consists of a mounting for the polarizer, 

 which is swung to the left of the optical axis when screw reaches the limit of motion downward 



Analyzer. Consists of a Thompson prism mounted in a revolving collar graduated in two-degree divisions with 

 every tenth line numbered ; collar revolves smoothly in cylindrical mounting fitting over draw tube and is slotted 

 to engage stud for zero point ; can be easily removed for insertion of microscope eyepiece. 



Polarizer. Consists of a high grade Nicol prism mounted with a revolving ring graduated in two-degree, divisions, 

 with every tenth line numbered, and having an indicating pointer ; entire mounting securely supported in sub- 

 stage and fixed for zero point by stud which engages corresponding slot. 



Mirror. Plane and concave, 50 mm. in diameter ; adjustable in two planes in a fork, mounted on a swinging 

 arm for oblique illumination. 



Finish. Brass Lacquered with block stand. 



Case. Of hard wood with polished finish ; fitted with brass lock and key. 



CROSS STREET : HATTCTlSr GARDEN EC 



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