Ergograph
An ergograph is a graph that shows a relation between human activities and a seasonal year. The name was coined by Dr. Arthur Geddes of the University of Edinburgh. It can either be a polar coordinate or a cartesian coordinate graph, and either a line graph or a bar graph.
In polar form, the months of the year are marked around the circumference, forming 30° sectors. Concentric lines display the value being measured. For example an ergograph could show the proportions of time devoted to each of certain activities, with a time scale, ranging from 0 to 24 hours per day, along the radius of the circle, as a square root scale. This form of an ergograph is an example of a polar line graph or a polar strata graph or polar layer graph, the "polar" denoting the system of polar coordinates used on the graph.
In cartesian form, the X axis is marked for the months of the year, and the Y axis is marked with the scale of the activity/activities.