444 TIME-CHART CH. XIX 



Friday, and come in on the other days, the other 

 coachman going in the opposite direction, and each 

 one will drive the end teams every day, but each 

 one will always drive the same middle teams. 



In arranging the time-table of a road it is con- 

 venient to make a time-chart, such as is used on 

 railroads. 



One is shown in Plate XXXII. ; the names of the 

 places and the distances are at the top, the hours 

 and minutes at the sides. If a coach were to start 

 from A at 10 o'clock, and run straight through, 

 without stopping, to F, thirty miles, arriving there 

 at i o'clock, its course would be indicated by the 

 dotted line representing a speed of ten miles an 

 hour. 



If it makes four stops of 3, 3, 5, and 3 minutes 

 each at B, C, D, and E, its course will be indicated 

 by the full line, the flatter angle of which indicates 

 its superior speed while running. If we suppose the 

 road to be varied in its character, so that, between 

 C and D, the pace must be slow, the time required 

 for that stage must be taken from the adjacent 

 stages, making them faster, or from the whole of 

 the rest of the route. 



This is shown, in a somewhat exaggerated man- 

 ner, by the line . If the road is 



up-hill from C to D, the speed coming down from 

 D to C can be greater than on the other portions 

 of the road, as shown by the return line. 



