The numbers were calculated by hand or by whatever method was available. The charts then were drawn by hand or sketched and sent to a graphics arts department to be produced for presentations.
Kind of like people used to write letters with a pen on paper, before computers came along (and, probably before typewiters too).
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bar charts and pie charts
Column charts Bar charts Line charts Pie charts XY (Scatter) charts Area charts Doughnut charts Radar charts Surface charts Bubble charts Stock charts Cylinder, Cone, or Pyramid charts See related links for detailed descriptions of all the chart types.
Bar charts are used for comparing different pieces of data to each other, using horizontal bars. Categories are organised vertically, values horizontally, to focus on comparing values and to place less emphasis on time. Stacked bar charts show the relationship of individual items to the whole. Bar charts can sometimes be used as a way of making charts for project management.
pie charts show the percentage of whatever the chart is displaying and bar charts show the improvement or difference in what the chart is showing. they are the same because if both the pie chart and bar chart are being used for the same situation, the data should be the same.
you can use bar charts,histograms and pie charts to display your data....