CUMBERS AND MEASURES. 9 



Metric. 



The METRE is the length, at C. of a platinum, bar preserved at 

 Paris and known as the Metre des Archives. 



1 millimetre (mm.). 

 10 mm. = 1 centimetre (cm.). 

 100 mm. = 10 cm. = 1 decimetre (dm.). 

 1000 mm. 100 cm. = 10 dm. = 1 METRE (mi). 



10 m. = 1 decametre. 

 100 m. '= 10 decametres = 1 hectometre. 

 1000m. = 1 00 'decametres = 10 hectometres =1- kilometre (kilom.) 



Conversion Table. 



1 m. =- 39 V 37079 inches = 3 '280899 feet (Kater 1818). 

 {l in. - 39-370432. inches =- 3*2808693 feet (Clarke 1866)?. 



1 inch 0-0254' m. 



1 foot 0-3048 m. 



1 yard ..0*9144 m. 



1 mile 1-6093 kilom. 



1 knot 1"855 kilom* 



I'mm 0*03937 inch. 



1 metre. 39*371 inches*- 



1 metre 1 3*2809 feet. 



1 metre 1-0936 yard. 



1 kilom. . .. 0*6214 mile.- 



(10) MEASURED OF AREA OR SURFACE. 



English. 

 1 square inch.- 



144 sq. inches 1 square foot. 

 1296 sq. inches = 9 sq. feet = I square yard. 

 43560 sq. feet = 4840 sq. yards 1 acre. 



27878400 sq. feet = 3097600'sq. yards = 640 acres = 1 sq. mile. 

 1 square geographical mile = 1*327 square miles. 



Metric. 



1 square millimetre (smm.). 

 100 smm. = 1 square centimetre (scm.). 



10000 smm. = 100 scm. = 1 square decimetre (sdm.). 

 1000000 smm. = 10000 scm. = 100 sdm. 1 square metre (sm.). 

 10000 square metres = 100 ares 1 hectare. 



