The bar method is in itself a simple one, but when the bars are combined in the manner shown in Fig. 101 the presentation becomes really more complex than if the data were shown in the form of curves.

Fig. 102 certainly brings out the information of Fig. 101 in much better form than any in which it is possible to show it by any combination of bars either vertical or horizontal. The person who is just beginning to chart data °°^5'-o''^% which he has used formerly in tabulated form is often =000 surprised to find how many inconsistencies exist in the

data and how many different

^ 1000

things there are which must be allowed for by some 500 method of estimate. In Fig. 102 the data for the United ° Kingdom are expressed in

'

.-i^'-^

-^rS^sS"^^

-.-.-==S53s:«s

''

Yale, Class '06.

ShefTield. Class '06.

net tons, and for the United pig. 100. Comparison of the Earnings for Five States in gross tons. Though Years after Graduation of the Yale University

. • f 4.1, f Academic Department Class of 1006, the

some correction of the forms yale Sheffield Scientific School Class of igoe,

of the curves as they appear and the Princeton University Class of 1901

in this chart would of There is a fallacy in making this comparison. The standard of

living undoubtedly went up between 1901 and 1906

course have to be made to

get a true comparison of the shipping of the two countries, for our purpose the thing of greatest interest is the general tendency of shipping in the two countries. This we can study fairly well from the general shape of the different curves, even though the curves cannot strictly be compared with each other in so far as total quantities are concerned.