32 



COMPARISON OF FRENCH AND ENGLISH MEASURES. 

 Measures of Weight. 



English Grains. Avord. Weight. 



Decigramme 1.5433 .. 



Gramme 15.4330 



Decigramme 154.3300 .. 0.022 



Hectogramme 1543.330 .. 0.220 



Kilogramme 15433.0000 2.204 



MEASURES OF CAPACITY. 



IMPERIAL. 



Galls. Pints. 



Litre .. 1.76377 



Decalitre 2 1.4464 



PHOTOGRAPHIC APPARATUS, 

 CHEMICALS, &c. 



MANUFACTURED AND SOLD BY 



THOMAS & RICHARD WILLATS, 



INSTRUMENT MAKERS, 

 98, CHEAP51DE, LONDON. 



Agent for the Liqueure Hongroise or Hungarian Solution, 

 Redman's Photogenic Paper , and Sensitive Solution. 



T. & R. WILLATS solicit the attention of the Scientific 

 Public, to the Improvements they have recently introduced in the 

 Construction of the PHOTOGRAPHIC CAMERA, which enables the 

 Operator to obtain the focus with much greater precision, than by 

 any other arrangement. 



