OPTICAL INSTRUMENTS, 



SPECTACLES in every variety of Shape and Material, with Best 

 Brazil Pebbles or Glasses. 



OPERA, READING, AND EYE GLASSES. 

 MILITARY, NAVAL, AND ASTRONOMICAL TELESCOPES. 



Oxy-Hydrogen Microscopes, Polariscopes, Achromatic Microscopes 

 CAMERA LUCIDAS POLARIZING APPARATUS. 



ELECTRO-METALLURGICAL APPARATUS. 



Single Cell Apparatus; Precipitating Tronghs and Batteries; 

 Apparatus for Electro-Plating: Binding Screws; Porous Jars; 

 Plaster Casts; Wax Moulds; and every Material required in the 

 varied Processes. 



Every Description of Apparatus for practically panning the varlon* 

 Branches of Natural Philosophy, of very superior Workmanship. 



In the Press, and shortly will be Published, 



AN ILLUSTRATED CATALOGUE 



OF OPTICAL, MATHEMATICAL, CHEMICAL, AND PHILO. 

 SOPHICAL INSTRUMENTS, 



BY T. & R. WILLATS, 98, CHEAPSIDB. 



V AD DOT, PRINTER, BERMONDSEY, SOUTHWARX. 



