118 



THE MICROSCOPE 



Tie Beck-Rowley Metallurgical Attadunent (Fig. 110)converts the 

 Standard London Microscope into a metalluTgical instrument by the 

 use of prisms. The Standard Metallurgical Microscope (Fig. 109) 

 is a model of the Standard London Microscope in which the stage of 

 the microscope is not fixed to the Umb of the instrument, but is 

 carried in a strong slide, and can be focussed up and down by 



means of a rack and 

 pinion, so that the 

 focussing can be done 

 by the stage and not 

 by the body. It does 

 not detract from the 

 performance of the in- 

 strument for other pur- 

 poses, and when racked 

 up to the correct posi- 

 tion will work with the 

 mechanical stage of the 

 standard microscope. 

 It can also be supplied 

 with any of the standard 

 substages, although for 

 purely metallurgical 

 purposes a substage is 

 not required. 



The third method 

 (Fig. Ill) has an elec- 

 tric light fixed to 

 the body tube of the 

 microscope which moves 

 up and down with the 

 illuminator as it is 

 focussed. 



The Beck -Rowley 

 Metallurgical Attach- 

 ment converts an 

 ordinary microscope 

 into an efficient metal- 

 • lurgical instrument 



The attachment may be readily attached or removed without 

 any alteration to the microscope. 



With this illuminator the light is projected along the tilting 

 axis of the microscope, and from thence by means of prisms into 

 the vertical illuminator; when this method is employed the 

 microscope tube can be racked up and down for focussing in the 

 ordinary way, and the inclination of the microscope can be 

 effected without in any way interfering with the original accuracy 

 of illumination. 



The Beok- 



Bowley 



Uetol- 



Ato^ent.FlO. 110.— No. 3225, Standard London 

 Microscope, aad Metallurgical Attach- 

 ment. 



