# Collections

Browse collections in random order. Refresh the page to get a new order.

By saltirenewsA Kaleidoscope works as a combination of reflections. Mirrors are typically arranged in an equilateral triangle producing multiple reﬂections as a symmetric pattern which changes as the triangle rotates.
The apps in this collection explain how it's done, and then, of course, turn the kaleidoscope into a clock!

Tags: reflections, clocks, kaleidoscope

By DuncanExploring Archimedes Trammel, an ancient tool for drawing ellipses.

Tags: trammel, curves

By Phil ToddSome apps illustrating Philip Todd's Presentation

*Using Force to Crack Some Geometry Chestnuts* by Mark Levi

Tags: Mechanic,

By Phil ToddA selection of illustrations from a few propositions in Books 1, 2 and 6 of Euclids Elements

Tags: Euclid

By Phil ToddThese apps accompany the presentation

** Finding the Fermat Point by Physics and by Transformation** in the

*More Favorite Geometry Proofs* session at MathFest 2014

Tags: Fermat, triangle, Toricelli, minimum

By saltirenewsLike your hands, an abacus lets you count in fives and tens. The first pair of columns are for hours, the second pair for minutes and the third pair for seconds. The bead at the top of each column counts for 5 single beads. The beads in the main compartment of the left column each count for 10 single beads. The bead in the top compartment, left column, counts as 50.

Tags: clocks, Abacus

By mmillaThis collection contains the examples apps that were created for "Creating HTML5 Apps with Mechanical Expressions."

Tags: examples

By Nick HalseyThis collection features several apps that were created for the electronic book for the iPad that adds interactive diagrams to Euclid’s Elements, a mathematical classic (Available from the iTunes store).

Tags: Euclid, Elements, Geometry, Proposition, Proof

By saltirenewsOur binary digital clock has 3 sections, red beads for hours, purple for minutes and cyan for seconds. Beads in the up position represent the binary digit 1, beads in the down position represent 0. In addition to the Binary Clock, we've provided a Binary Test app to practice your binary numbers.

Tags: clocks, Binary numbers

By Phil ToddApps for presentation entitled "Creating electronic handouts and assessments as browser, tablet or smartphone apps"

Tags: talk, NWMC

By mmillaThis collection contains the examples apps that were created for "Creating HTML5 Apps with Geometry Expressions."

Tags: examples

By Phil ToddSome apps illustrating ideas in

*The Mathematical Mechanic* by Mark Levi

Tags: mechanics

By Phil ToddApps accompany Phil Todd's presentation: "Symbolic mechanics: from optimal trebuchets to simple chaotic machines"

Tags: Wolfram, trebuchet, chaos

By Isabel MuenchThese apps are taken from Book I of Euclid\\\'s Elements. Proposition 1 shows how to construct an equilateral triangle. Proposition 2 demonstrates how to create a straight line equal to a given straight line. Finally, proposition 3 teaches how to cut off a straight line that is equal to a given line from a larger line.

Tags: Euclid\\\'s-Elements, Basic-Constructions

By Andrew ZhaoSeveral of these exist already, but these are my favorite apps from the original book.
-Andrew

Tags: Euclid

By
By saltirenewsWe begin this collection of weird and wonderful mathematical clocks with the Morphing Clock that changes shape as time passes. The Geometry Expressions file is included so you can see how it was made and make new versions for yourself!

Tags: clocks, morphing curves