ESTABLISHED 1825. 



Telephone 1625 Koyal, Liverpool. 

 „ 643 City, Manchester. 



Telegraphic Address- 

 Specular, Liverpool. 

 Specular, Manchester. 



Thos. Armstrong & Brother 



l»dnuracturltid Opticians, 



112, BOLD STREET, LIVERPOOL, 



AlBO at 78, DEANSGATE, MANCHESTER. 



Contractors to the Admiralty, War Office, India Office, &c. 



OPTICIANS TO THE ROYAL INFIRMARY. 

 Scienlific Instrument takers to H.M. Science and Art Department, South Kensington. 



STUDENTS' TRIPOD STAND MICROSCOPE 



With rack sub-stage and Iris diaphragm, adapted to use 

 objective as achromatic illuminator, and micrometer screw 

 fine adjustment, witli draw tube; a highly-finished and 

 thoroughly-improved instrument ; one eye-piece in cabinet. 



£6 17s. 6d. 



LARORATORY STAND, 



similar to above, 

 with large vulcanite 

 top stage suitable for large trough, Continental body 

 extending to English length by draw tube divided in 

 m/ms, rack and pinion focussing siding out sub- 

 stage with centring adjust- 

 ment. Fine adjustment read- 

 ing to l-2000ths inch. A 

 highly-finished soundly made 

 stand with one eye piece in 

 Cabinet. 



£10 lOs. 



STAND, as above, witli rack 

 adjustment to draw tube an<i 

 mechanical top stage, as illus- 

 tration, 



£13 1 5s. 



Metallurgical Stands 



Specially constructed fo«* 

 Engineers. Specification 

 on application. 



Repairs a Speciality. 



Prepared Specimens in great 



variety. 

 Mounting material and Micro- 

 scopic glass in great 

 variety. 



Catalogues Free on 

 Application. 



