LIBRARY 



USEFUL KNOWLEDGE. 



NATURAL PHILOSOPHY 



OBJECTS, ADVANTAGES, AND 



PLEASURES OF SCIENCE. 

 MECHANICS. 

 HYDROSTATICS. 

 HYDRAULICS. 



PNEUMATICS. 

 HEAT. 

 OPTICS. 



DOUBLE REFRACTION AND 

 POLARISATION OF LIGHT. 



WITH 



AN EXPLANATION OF SCIENTIFIC TERMS, 



AN INDEX. 



LONDON: 

 BALDWIN AND CRADOCK, PATERNOSTER-ROW. 



MDCCCXXIX. 



