BAIRD &. TATLOCK (LONDON) LTD. 



Microscopes by Crouch, London. 



1192 



1192 T The " Opsonist " Microscope. Crouch's, as specified below, in polished teak case 



This Microscope has been designed to meet the requirements of those preferring a side focussing adjustment 

 in place of the older form. The movement is provided with a cylinder, divided to read to o.ooi mm., and with 

 milled heads on each side of the limb. The coarse focussing adjustment is by means of a diagonal rack and 

 pinion. 



The stage has vertical and cross traversing adjustments, by quick screw and rack and pinion of 2! in. and i in. 

 respectively (65 mm. by 25 mm.), and the cross traverse is removable so that a plate cultivation, Petri dish, or 

 large section can be examined without difficulty. 



The convenient application of the high power dark ground method of illumination is also provided for. 



The substage is perfectly centred to the objectives and condenser supplied with it. Should a centring arrange- 

 ment be necessary, as in the case of the dark ground illuminator, it is fitted to this accessory as the more convenient 

 method in a working or laboratory model. 



Kither of the three forms of illuminator in use can be fitted to this stand. 



It is fitted with large mirrors, plane and concave. The foor is of solid brass and the microscope can be inclined 

 at any angle required. 



When used in the upright position the substage and mirror are conveniently adjustable, and the eye-point 

 nearer the observer, necessitating less stooping. 



The usual outfit includes three objectives, the J in., J in. N.A. .85, and oil-immersion T ',j in., N.A. 1.30, the 

 latter fitted with stop for use with dark ground Illuminator. These eyepieces, magnifying with a tube length of 

 170 mm. by 4 by 6, and compensating by 8. Abbe condenser, N.A. 1.20, with iris diaphragm, high power dark 

 ground condenser, dust proof triple condenser (all objectives being adjustable to same focal plane, and carefully 

 centred). 



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CROSS STREET HATTCHSr GARDETST, E- C 



