ESTABLISHED 1825. 



Telephone 1625 Royal, Liverpool. 

 ,, 643 City, Manchester. 



Telegraphic Address: 



Specular, Liverpool. 

 Specular, Manchester. 



Thos. Armstrong & Brother, 



flDannfacturiuG ©pticians, 

 112, BOLD STREET, LIVERPOOL, 



And at 78, DEANSGATE, MANCHESTER. 



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



OPTICIANS TO THE ROYAL INFIRMARY. 

 Scientific Instrument Makers to H.M. Science and Art Department, South Kensingrton. 



STUDENTS' TRIPOD STAND MICROSCOPE 



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

 olijective as achromatic illuminator, and micrometer screw 

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

 tliDrou^hly-improved instrument; one eye-piece in cabinet. 



£6 17s. 6d. 



LABORATORY STAND, r; 



similar to above, with 

 ) l.Trge vulcanite top stage 

 8uital>le for large troveh. Continental body extending 

 English length by draw tube divided in ni/nis, rack 

 and pinion focussing siding 

 out sub-stage with centring 

 adju.itment. Fine adjust- 

 ment reading to l-2000th8 

 inch, a highly - finished 

 soundly-made stand with 

 one eye-piece in Cabinet. 



£10 lOs. 



STAND, as above, with 

 ravk adjustment to draw 

 tube and mechanical top 

 stage, as illustration. 



£13 15s. 



Metallurgical Standi 



Specially constructed 

 Engineers. Specificate 

 on application. 



REPAIRS A SPECIALI1 



Prepared Specimens 

 great variety. 

 Mounting Material 

 Microscopic Glass il 

 great variety. 



CATALOGUES FREE 

 APPLICATION. 



