PLAIN AND ACHROMATIC 



MICBOSCOPES, 



MAGNIFYING GLASSES, 



fejerts, aenaess, 



MANUFACTURED AND SOLI) BY 



THOMAS & RICHARD WILLATS, 



OPTICIANS AND PHILOSOPHICAL INSTRUMENT 

 MAKERS, 



98, CHEAPSTBE. LONDON. 



. s. d. 

 Magnifying Glasses in horn mountings, with one, two, or 



three lenses figs 2 and 3, Is to 066 



Ditto ditto in tortoiseshell mountings, figs. 2 and 3, Is 6d to 7 6 

 Oval and Round Reading Glasses in horn cases, fig. 1, 



from 2s to 7 6 

 Ditto in tortoiseshell or pearl cases with silver mountings 



from 1 to 2 > () 

 Cloth Microscopes for ascertaining the number of threads in 



a given space of linen cloth, in case fig- 4, 2s and 2 < 



Linen Microscopes, to fold for the waistcoat pocket, with 



apertures of f-in. -i n . and ^ in . .fig. 5, from 3s 6d to 5 6 

 Stanhope Lenses in white metal frames, fig. 6, 2s 6d, 



3s 6d and 046 



Ditto ditto, in silver frames fig. 6, 5s, 7s 6d, and 10 



Ditto ditto in chased gold fig. 6110 



Ditto ditto in plain gold t fig. 6, from 015 



