M^IP 



BAIRD .ScTATLOCK (LONDON) LTD. 



'VW-* 



979-981 



Leitz's Micro -Metallograph. 



I !:r micro-metallograph shown in above figure is designed for visual observation as well as lor the photo- 



.iphic study of metal surfaces. The construction of the apparatus embodies the principle first applied 



y l.r Chutelier and certain improvements suggested by Dr. \V. Guertler, that is to say the object is placed 



ipon the stage (T), whilst the objective is underneath. In the act of focussing the stage moves together with 



the object, whereas the objective and the illuminating system remain stationary. This part of the apparatus 



is its most important feature.* The apparatus has the advantage that it is available with any magnification, 



Li-sides being readily adjustable in such a manner as to obviate detrimental reflections or glares. 



[lie micro-metallograph consists essentially of three parts, all of which are mounted upon an optical bench, 

 viz., a stand with tube and stage, a lamp with iris-diaphragm and illuminating lenses, and a photographic camera. 



Descriptive Pamphlet on upj-lication. 



979' Micro-metallograph with illuminating apparatus on small optical bench with electric arc 

 lamp burning at 4 amps., on stand, diaphragm disc with iris diaphragm and illuminating 

 lenses, focussing and adjusting keys, carrier with dark glass cap for the eyepiece 



980 ' Large mechanical stage fitting the fixed stage of the metallograph . . . . extra 



981' One Photographic Camera on optical bench, with 280 millimetres extension, ground glass 

 and transparent focussing screen, two single dark slides 13 by 18 centimetres (7 by 5 in.) 

 with 9 by 12 centimetres (4^ by 3$ in.) plate-holders and focussing lens 



982' A larger Camera of i metre extension can be supplied with two dark slides, 24 by 24 centi- 

 metres plates, and having carriers for 18 by 13 and 12 by 9 centimetres ; 18 by 18, 13 

 by 13, and 9 by 9 centimetres plates, or English sizes at an extra cost of 



983' Rheostat for a no volt circuit * .. .. .. .. .. 



.\983' for a 220 volt circuit* 

 984 ' Mirrosummar F/4.5== 42 millimetres focal length 

 A984 T ,, F/4-5=35 millimetres focal length 



985 ! Objective No. I . . 



986 



987' 



988' 



989' 



990 



991' 



992 



993' 



No. 2 . . 



No. 3 



Xo. 4 .. 



No. 5 



Xo. 6 . . 

 ,, Xo. ya 



Xo. 8 . . 

 I-J2 inch oil-immersion lens, N.A. 1.30 



994' 2 millimetres apochromatic objective 

 995' Eyepiece Xo. 2 . . 



25 

 4 



15 

 5 



500 



2 

 

 1 

 3 

 3 

 

 

 

 1 

 1 

 1 

 2 

 2 

 5 

 12 

 



10 



15 



4 

 

 



15 



15 



15 



5 

 5 



10 















10 



5 



*\Vhen ordering, please state whether the available current is continuous or alternating, and the voltage. 



