ESTABLISHED 1825. 



Telephone 1625 Royal, Liverpool. 

 :', .. 643 Manchester. 



Telegraphic Address : 

 Specular, Liverpool. 

 Specular, Manchester. 



THOS. ARMSTRONG & BROTHER, 



ZfPLannfactuving ©pticians, 



112, BOLD STREET, LIVERPOOL, 



And at 88 & 90, DEANSGAFE, /VIANCHESTEK. 



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



OPTICIANS TO THE ROYAL INFIRMARY. 



Scientific In.strument Mal<ers to H.M. Science and Art Department, South Kensington. 



STUDENTS' TRIPOD STAND MICROSCOPE 



With racl: suU-stago and Iris diaphragm, adapted to u^- 

 ol)J2ctive as aciiromatic illuminator, and micrometer screw 

 tine adjustment, with draw tube; a highly finished an 

 thoroughly improved instrument: one eye-piece, in cabiui 



17s. 6cl. 



LABORATORY STAND, 



imilar to above, will 

 ) large vulcanite top stag 

 suitable for large trough. Continental body extendiu;^ 

 to Kiiglish length by draw tube divided in m/ms, rack 

 and pinion focussing sidiiij 

 out sub-stage with centrii 1 _ 

 adjustment. Fine adjust 

 ment reading to l-2000tli- 

 inch, a highly - fiuisliLfl, 

 soundly-niadc stand with 

 '>nc eye-piece in Cabin <• 



£10 10s. 



STAND, as above, witli 

 rack adjustment to draw 

 tube and mechanical top 

 stage, as illustration, 



£13 15s. 



^^Z^ 



Metallurgical Stands 



Specially constructed for' 

 Hngineers. Specification 

 on application. 



REPAIRS A i»PECIALITV. 



Prepared Specimens in great 

 variety. 



Mounting Material and 



^Microscopic Glass in 



great variety. 



Catalogues free on 

 application. 



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