Minnrtota Valley Canning Company, Beaver Dam , Wis., "Annual Report for the Fiscal Year Ended March 31, 1938."

A. A Comparison of the Shipmenf of One Brand of Peas and the Shipment of All Others by the Minnesota Valley Canning Company in the Years 1932 and 1937.

The reason for including this chart is to illustrate an optical illusion which is seldom seen and which should be avoided. Note how the bars are distorted to the left because of the cross hatchings.

OISAIUNC INJURKS

p r

MAN- HOURS WORKIO

FRCQUiNCY RATCS

r r

i

WPA, "Report on Progress of The Works Program," December. 193 7. SCALE .5

B. Relation of Man-hours Worked to Disabling Injuries Incurred in Works Progress Administration Project Work for 1936 and 1937.

1. Bar charts with contrasting units are

used chiefly to differentiate various bars. Here one type of hachure is used for the year 1937 in each of three charts and another for 1936.

2. Since neither complete vertical rulings

nor numerous stubs are used, it might have been better to include the actual figures.

3. Note that in horizontal bars the latest

year is usually at the bottom so that the reader looks down from the top rather than up from the bottom.

GRAPHIC PRESENTATION

Abstracts from Time Series Charts. A Manual of Design and Construction, 1938, prepared by Committee on Standards for Graphic Presentation, under procedure of American Standards Association, with The American Society of Mechanical Engineers as sponsor body.

Specific column designs or shadings ore recommended os follows: