ESTABLISHED 1825. 



Telephones: Telegraphic Address: 



1625 Royal, Liverpool. Specular, Liverpool. 



643 City, Manchester. Specular, Manchester. 



THOS. ARMSTRONG & BROTHER, 



ilDanufactuting ©pticians, 

 112 BOLD STREET, 



LIVERPOOL. 



Also 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 Kensington. 



STUDENTS' TRIPOD STAND MICROSCOPE 



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

 illuminator, and micrometer screw fine adjustment, with draw tube,- a highly- : 

 finished and thoroughly improved instrument, one eye piece in cabinet. 



LABORATORY STAND 



Similar to above, with large vulcanite top stage suitable for large trough. Con- 

 tinental body extending to English length by draw tube divided into m/ms,, : 

 rack and pinion focussing swing out sub stage with centreing adjustment. Fine , 

 adjustment reading to l-2000ths inch. A highly-finished, soundly made stand, 

 with one eye-piece in cabinet. 



STAND 



As above, with rack adjustment to draw tube and mechanical top stage. 



METALLURGICAL STANDS, 



Specially constructed for Engineers. Specification on application .; 



Prepared Specimens in great variety. 

 Mounting Material and Microscopic Glass in great variety. 



Repairs a Speciality. Catalogues Free on Application. 



