340 



Appendix. 



APPENDIX. 



(From Attfield's Chemistry.) 



The Metric System of weights and measures is 

 founded on the meter. The engraving represents a 

 pocket folding measure, the tenth part of a meter in 

 length, divided into ten centimeters, and each centi- 

 meter into ten millimeters : 



Fig. 19. 



The Decimeter. 



The units of the system with their multiples and 

 Bubmultiples are as follows : 



UNITS. 



Length. — The Unit of Length is the meter, derived 

 from the measurement of the quadrant of a meridian 

 of the earth. (Practically, it is the length of certain 

 carefully-preserved bars of metal from w^hich copies 

 have been taken.) 



Surface. — The Unity of Surface is the are, which is 

 the square of ten meters. 



Capacity. — The Unity of Capacity is the liter, 

 which is the cube of a tenth part of a meter. 



Weight.— The Unit of Weight is the gramme, which 

 is the weight of that quantity of distilled water, at 



