Geographical Tables. 819 



First pair, one inch, seventeen and a half twentieths. 



Second pair, one inch, seventeen twentieths. 



Third pair, one inch, sixteen and a half twentieths. 



It may be seen by these dimensions, that with the present 

 faces of the cube, had there have been no decrement of the solid 

 angles, but the whole space filled, and the cubic faces extended to 

 form a square figure, it would not have been a perfect cube. A. 



TABLES 

 For converting French Toises and Metres into English Feet, and the contrary. 



Readers of philosophical works, and foreign journals, frequent- 

 ly meet with dimensions expressed in French measures. To 

 enable such to convert them readily into English measures, the 

 following tables have been computed. The length of a toise and 

 a metre in English measure, which are the foundation of the ta- 

 bles, have been taken from Baily's Astronomical Tables and For- 

 mulcB, and he deduced them from their lengths, as given in the 

 Base du Systeme Metrique, vol. iii. and Captain Kater's paper on 

 the length of the French metre, in the Phil. Trans, for 1818. 



1 French Toise = 1.949036 French Metres = 6.394950 English Feet. 

 1 French Metre = .513074 Toise = 3.280899 English Feet. 



1 English Foot = .156373 Toise = .304794 French Metre. 



TABLE II. FOR CONVERTING FRENCH TOISES INTO ENGLISH FEET. 



TABLE III. FOR CONVERTING FRENCH METRES INTO ENGLISH FEET. 



