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.
Concentric lines display the value being measured.
For example an ergograph could show the proportions of time (in hours per day) 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.
[3] In cartesian form, the X axis is marked for the months of the year, and the Y axis is marked with the scale(s) of the activity/activities.