10 



NUMBERS A^D MEASURES. 



Conversion Table,. 



1 sq. inch. ...6 '451 scm. 



1 sq. foot... 929 scrn. 



1 sq. yard ... 0*8361 sm. 



1 acre ...40467 sm. 



1 sq. mile ...2 '59 sq. kiloms. 



1 scm 0*155 sq. inch. 



1 sm...,., ,.1 ( 764 sq. ft. 



1 sm 1'196 sq. yd. 



1 are .119*6 sq. yd. 



1 hectare 2 '4 71 acres. 



1 sq. kilo-m. ,,.0'3861 sq. mile. 



(11) MEASURES .OF V.OLUME OR CAPACITY. 

 English. 



A GALLON is the volume occupied by 10 Ib. of water weighed in 

 air against brass (A 8 '143) weights at 62 F. and under the baro- 

 metric pressure of 30 inches. 



Under the same conditions a cubic foot of water has been found 

 (Chaney, J889) to weigh 62 '278601 Ib. 



1 cubic inch. 



,34 '683 cub. inches .= 1 pint. 



277-463 cub. inches .= 8 pts. = 1 GALLON = 0*16057 cub. foot. 

 1728 cub. inches = 49*823 pts. = 6'22786 gal. = 1 cubic foot. 

 465 cub. inches = 1345*2 jts. = 168 152 gal. = 27 cubic feet 



= 1 cubic yard. 

 (5,451,776,000 cub yards = 1 cubic mile.) 



N. B. Since one volume of water at 39 F. becomes 1*00112 

 volumes at 62 F.., and seven-eighths of a cubic foot of standard air 

 weigh '0664 -Ib., a cubic foot of water in vacuo at 39 F. weighs 

 (62-415 Ib. 



Metric. 



A LITRE is the volume occupied by one kilogram (2*20462 Ib.) of 

 \water in vacuo at 4 C. j it is very nearly a cubie decimetre. 



1 cubic centimetre (ccm. ). 

 1000 ccm. = 1 LITRE (cubic decimetre) (1.). 

 1 000 000 ccm. = 1000 1. = 1 STERE (cubic metre). 



Conversion. 



1 cub. inch.... 16 '383 ccm. 



1 pint 568-23 ccm. 



1 gallon 4-54586 1. 



1 cub. foot ....28-311 1. 

 I cub. yard... 764 -4 1. 



