Ergograph

{{about||the muscle-measuring device|Mosso's 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 system|polar coordinate]] (circular) or a [[cartesian coordinate system|cartesian coordinate]] (rectangular) graph, and either a [[line chart|line graph]] or a [[bar chart|bar graph]].<ref name=MisraRamesh>{{cite book|title=Fundamentals of cartography|author=Rameshwar Prasad Misra and A. Ramesh|edition=2nd|publisher=Concept Publishing Company|date=1989| isbn=9788170222224 |pages=438}}</ref><ref name=Monkhouse>{{cite encyclopaedia|encyclopedia=A Dictionary of Geography|author=Francis John Monkhouse|title=A Dictionary of Geography, Second Edition|edition=2nd|publisher=Aldine Transaction|date=2007| isbn=9780202361314 |pages=127}}</ref><ref name=Richardson />

In polar form, the months of the year are marked around the circumference, forming 30° [[circular sector|sector]]s. 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.<ref name=MisraRamesh /><ref name=Monkhouse /> This form of an ergograph is an example of a '''polar line graph''' or (because the data form "bands" on the graph) a '''polar strata graph''' or '''polar layer graph''', the "polar" denoting the system of polar coordinates used on the graph.<ref name=Richardson>{{cite book|title=Illustrations|author=Graham T. Richardson|publisher=Humana Press|date=1985| isbn=9780896030701 |pages=49–50}}</ref> 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.<ref name=MisraRamesh /><ref name=Monkhouse />

==See also== *[[Seasonal adjustment]]

== References == {{reflist}}

== Further reading == * {{cite journal|journal=Transactions and Papers (Institute of British Geographers)|issue=16–19|author=Institute of British Geographers|publisher=G. Philip|date=1950|pages=2,184}}

[[Category:Statistical charts and diagrams]] [[Category:Seasonality]]

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