CONVERSION OF MEASURES OF TIME AND ANGLE. li 



Table 68. Miles into kilometres. table se. 



I mile = 1.609347 kilometres. 

 The table extends from o to 1000 miles with argument to single miles, 

 and from 1000 to 20000 miles for every 1000 miles. The tabular quantities 

 are given to the nearest kilometre. 



Table 69. Kilometres into miles. table 69. 



I kilometre — 0.621370 mile. 

 The table extends to 1000 kilometres with argument to single kilo- 

 metres, and from 1000 to 20000 kilometres for every 1000 kilometres. 

 Tabular values are given to tenths of a mile. 

 Example : 



Convert 3957 kilometres into miles. 

 The table gives 



(3000 + 957) kilometres = (1864. i + 594.7) miles = 2458.8 miles. 



Table 70, Interconversioii of natitical and statute miles. table 70. 



The definition of the nautical mile here used is that adopted by the 

 U. S. Coast and Geodetic Survey. 



A nautical mile is equal to the length of one minute of arc on the 

 great circle of a sphere whose surface is equal to the surface of the earth. 



Computed on Clarke's spheroid of 1866, the nautical mile thus defined 

 equals 6080.27 feet. {Report, U. S. Coast Survey, 1881, page 354.) 



The table gives, for nautical and statute miles from i to 9, the equivalent 

 in statute and nautical miles, respectively, to four decimals. 



TABLE 71. 



Table 71. Continental measures of length zvith their metfic and English 

 equivalents. 



This table gives a miscellaneous list of continental measures of length 

 alphabetically arranged, with the name of the country to which they belong 

 and their metric and English equivalents. 



CONVERSION OF MEASURES OF TIME AND ANGLE. 

 Table 72. Arc into time. 



i° = 4mj i'=.4S; i" = ^s^ 0^067. 

 Example : 



Change 124° 15' 24''7 into time. 

 From the table. 



TABLE 72 



8h 17m js^^j 



