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Embodying the Calculus: Planimeters and Analogue Computing
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Charles Care
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Paper given at BSHM Postgraduate Research in Progress, Oxford, February 2005.
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Embodying the Calculus: Planimeters and Analogue Computing
1.
Embodying the Calculus: Planimeters
and Analogue Computing Charles Care Feburary 2005
2.
• Planimeters invented
and re-invented throughout the 19th Century. – Hermann (1814) – Gonnella (1824) – Oppikofer (1827) – Wetli (1849) – Sang (1851) – Amsler (1854) • Principle uses in: – Land area calculation – Indicator diagrams
3.
Using a planimeter
to calculate the area of an indicator diagram
4.
A roller can
be used to calculate the length S ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ £ £ £ £ £ £ £ £ £ £ £ £ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ £ £ £ £ £ £ £ £ £ £ £ £ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ £ £ £ £ £ £ £ £ £ £ £ £ h ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ £ £ £ £ £ £ £ £ £ £ £ £ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ £ £ £ £ £ £ £ £ £ £ £ £ S
5.
Calculating the area
under a two-state function ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¥ ¥ ¥ ¥ ¥ ¥ ¥ ¥ ¥ ¥ £ £ £ £ £ £ £ £ £ £ £ h2 ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¥ ¥ ¥ ¥ ¥ ¥ ¥ ¥ ¥ ¥ £ £ £ £ £ £ £ £ £ £ £ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¥ ¥ ¥ ¥ ¥ ¥ ¥ ¥ ¥ ¥ £ £ £ £ £ £ £ £ £ £ £ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¥ ¥ ¥ ¥ ¥ ¥ ¥ ¥ ¥ ¥ £ £ £ £ £ £ £ £ £ £ £ h1 ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¥ ¥ ¥ ¥ ¥ ¥ ¥ ¥ ¥ ¥ £ £ £ £ £ £ £ £ £ £ £ S2 S1
6.
Scaling the rotation
according to the function’s height
7.
The cone provides
a different gear for every possible value in the y-axis
8.
An Oppikofer planimeter
9.
A model of
an Oppikofer planimeter
10.
The Hermann Planimeter
11.
The Wetli Planimeter
12.
A differential analyser∗ ∗
Crank, J. The Differential Analyser. Longmans, London, 1947.
13.
Embodying the Calculus: Planimeters
and Analogue Computing Charles Care Feburary 2005