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Phil Todd uploaded a new app: September Problem 7 years, 2 months ago
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Phil Todd uploaded a new app: Projectile High Poi… 7 years, 4 months ago
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Phil Todd uploaded a new app: Maximum Area Triang… 7 years, 4 months ago
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Phil Todd uploaded a new app: Abacus Corrected 8 years, 1 month ago
An abacus clock. Our previous version illustrated an idiosyncratic use of the abacus. In this version, we conform to international standards: the value of the "five" bead is 0 when it is in the upper position, and 5 in the lower position.
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Phil Todd uploaded a new app: Coordinate Clock 8 years, 1 month ago
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Phil Todd uploaded a new app: A triangle from med… 8 years, 3 months ago
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Phil Todd uploaded a new app: four bar coupler cu… 8 years, 4 months ago
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Phil Todd uploaded a new app: Four Bar linkage wi… 8 years, 4 months ago
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Phil Todd uploaded a new app: Four Bar Linkage 8 years, 4 months ago
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Phil Todd uploaded a new app: A Median Theorem 8 years, 5 months ago
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Phil Todd uploaded a new app: Tchebychev's S… 8 years, 5 months ago
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Phil Todd uploaded a new app: Watt's Linkage 8 years, 5 months ago
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Phil Todd uploaded a new app: Paucellier's l… 8 years, 5 months ago
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Phil Todd uploaded a new app: Gear pair 8 years, 6 months ago
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Phil Todd uploaded a new app: gear related to belt 8 years, 6 months ago
We imagine two wheels connected by a belt which is wrapped in a figure 8, so that the wheels rotate in opposite directions.
We show half the belt. Drag the red point to see it move.
Now imagine we cut the belt at the blue point. You can drag the two blue points to see the involute curves.
Press Show to turn the curves on p…[Read more]
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Phil Todd uploaded a new app: Crank Slider 8 years, 6 months ago
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Phil Todd uploaded a new app: Regiomontanus Probl… 8 years, 7 months ago
We seek the place on the earth’s surface where a vertically suspended bar (or the rings of Saturn) look the biggest.
A machine to solve this problem consists of a mass fixed to the earth’s surface and a couple of bars attached to the mass and constrained to pass through the ends of the bar. A spring between the bars pushes them apart.
The…[Read more]
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Phil Todd uploaded a new app: Minimum Perimeter I… 8 years, 7 months ago
Three masses are constrained to lie on the edges of a triangle. Equal constant force actuators (with force F) are attached to each pair of masses. When this system finds equilibrium, the potential energy will be at a minimum. However, the PE in each actuator is simply F times L, where L is the length of the actuator.
Hence minimum PE is ach…[Read more]
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Phil Todd uploaded a new app: Two ways of finding… 8 years, 8 months ago
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Phil Todd uploaded a new app: Incircle Point of C… 8 years, 8 months ago
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