E. & J. BECK'S MICROSCOPES. 71 



can be used on the ring by placing the instrument in an 

 upright position. Eack and pinion quick motion, lever 

 fine motion placed behind the limb moving the whole 

 body tube; the body tule is fitted with broad gua^e 

 screw one and a quarter inch diameter, and in which 

 fits adapted with regular society screw, tripod ba'se 

 with single pillar, the axis on which the instrument 

 turns is placed in such position that the instrument is 

 perfectly balanced when placed in horizontal position 

 for drawing. When so placed the centre of eye-piece 

 is seven and a half inches from table, the standard is 

 furnished with a B eye-piece. The mirror and sub- 

 stage can be fitted with divided arch for measuring the 

 obliquity of light, the sta^e can also have divided circle 

 for measuring the angle of crystals. Stand all made of 

 polished brass. 



K. & j. BECK'S MICROSCOPE. 



K. & J. Beck, of London, the old and well-known 

 firm, have established an American agency in the 

 United States. In their facilities for the production of 

 first-class workmanship they are not excelled. As 

 makers of London instruments, they have been long 

 and favorably known, and the Londoner points with 

 commendable pride to the names of Ross, Powel, Lea- 

 land, and R. & J. Beck. 



No attempt can be made in these pages to describe a 

 tenth part of the stands manufactured by the Messrs. 

 Beck. Their catalogue will be found to include all the 

 various grades, where may be found elegant and expen- 



