66 Advertisements. 



PHOTOGRAPHIC APPARATUS. 



Daguerreotype, Calotype, Cyanotype, Chromatype, Crysotype, An- 

 thotype, Energiatype, Ferrotype, Tithonotype, Catalissisotype, Gaudi- 

 notype, etc. etc. Artists and Amateurs desirous of practising the 

 varied processes of this interesting Art are requested to observe the 

 great improvements that have taken place in the construction of the 

 apparatus, and the simplification of the processes employed, by which 

 they are now enabled, in a very short period, to arrive at a degree of 

 success hitherto unattainable ; in addition to which, in consequence of 

 the altera_tion of the import duties, THOMAS and RICHARD WILLATS 

 are enabled to offer several of the apparatus and materials at consider- 

 ably reduced prices. Merchants and the trade supplied on liberal 

 terms. 



THOMAS & RICHARD WILLATS, 



OPTICIANS AND PHILOSOPHICAL IKTSTRU 

 MAKERS, 



98, CHEAPSIDE, LONDON. 

 LISTS OF PRICES FORWARDED GRATIS. 



DISSOLVING VIEWS. 



Apparatus for exhibiting the Dissolving Views as shewn at the Royal 

 Polytechnic Institution, with the Hydro-Oxygen Light ; or on a 

 smaller scale, suitable for Private use, Schools, etc. illuminated by 

 Patent Argand Lamps, and constructed on the ii'ost improved prin- 

 ciples, by T. & R. WILLATS, Opticians, 98, Cheapside, London, who 

 have on hand a large collection of 



PHANTASMAGORIA AND MAGIC LANTERNS, 



together with SLIDES, for illustrating Lectures on Natural History 

 Botany, Geology, and Astronomy. 



Comic Slitles in great variety. 



