The Number of Persons Working On and Above the Sixth Floor in the Cloak and Suit Industry and the Dress and Waist Industry in New York City

This chart was made first for a wall exhibit and was later used in a widely distributed report. The co-ordinate ruling has the shape of a New York manufacturing building. By observing this illustration from the left edge of the page the reader may get the general effect of a frequency curve

photograph of Fig. 141 representing the number of men actually seen. These bar diagrams to represent frequency are not of very great use, except possibly in advertising work where it may be necessary to get some kind of chart which can be understood by any untrained reader. In Fig. 142 an effective use has been made of the frequency-curve scheme in a report intended for wide circulation among persons who have not been trained in reading curves. The general outline of a tall New York manufacturing building is given very clearly as a field of co-ordinate ruling, on which the actual numbers of workers for any floor level can be read from the horizontal scale with a fair degree of accuracy. The numbers working below the sixth floor are very large, and only those on and above the sixth floor are shown.

FREQUENCY CURVES

This allows the use of a large scale for the data of the upper floors. In order to see the general shape of a frequency curve when plotted with flat tops instead of peaked tops, the book may be turned so that the illustration is seen from the left-hand edge. This chart was drawn primarily as a wall exhibit, to be used later as an illustration in a printed report. The general scheme is excellent and it could scarcely be improved upon, even though the independent variable has here been made the vertical scale instead of the horizontal scale.