Variations Of Terrestrial Time.
We give below a table showing differences in time between the principal cities in the United States. To find the difference - say the difference Between New York and Chicago - look for New York in the column of names on the side, and for Chicago on the top. Follow the line of figures opposite each one until they intersect at 54 which is the difference in time in minutes. The traveler from east to west will find his watch continually getting fast, but when he returns it will get slow. With the following table in his pocket, he can know the correct time of the place he is at, without constantly changing his watch.